for packaging in hex

Fix misprint in #130

Digest could mean HTTP Digest Authentication which is completely
different from what we call Digest currently. Renaming this is
essential to implement the actual HTTP Digest Authentication

Missed in original work.

Algorithm change had bug where ets:select return
value was incorrectly assumed to be the object key
and not the entire object causing the following
delete attempt based on a matchspec and the key to fail.

This meant that ets was not updated to reflect the completed
requests on each connection and causing exaustion of pipelines
event though connections were idle.  Functional test added which
demonstrated the problem.

In prior commit, missed switch of matchspec to work
with deletes, fixed here.

Added retry logic for race conditions around lb and
conn both trying to update same record at the same time.
If more than max is experienced, just let it go, things
will probably be ok.

Big commit. Switched algorithm to one which will favor
the connection with the smallest pipeline first
(deciding ties by timestamp of last finished request,
and then by pid as ultimate tie breaker).

Note: this also drastically changes the internal
representation of the connection in ets and is dependent
on specific order of operations when changing key values
to limit risk of race conditions between loadbalancer
and a given connection.

Also removed connection reporting of start of request
as this was no longer necessary since the load balancer
tees up the entry into ets with a 1.

Use of foldl for iteration is not hidden as implementation
detail.  Also hid details of how to message conn to set
tracing within API.

Difference between speculative and "real" size was no
longer material to the algorithm.  Used macro to enforce
consistent usage of ceiling for pipeline.

Created better abstractions on current ets table layout
to communicate what we want to accomplish, not how.

HTTP connection process now manages both scenarios
requiring cleaning up of the load balancer's ets table;
instead of this being owned by both the conn and lb.

Moved all interactions with ets table tracking
connections to API functions on ibrowse_lb,
to reduce knowledge of ets table and its structure.

Also fixed "bug" where ceiling for pipelining
threshold was different than the set value for increment;
made them the same.

Tracking size in http connection process state
was unnecessary as it wasn't queried for logic
or obvious reporting and ets table should have
right (within 1) value already.

Got rid of duplicated information in order to
reduce complexity and change points for upcoming
algorithm changes.

Via ets man page:
Note that for tables of the ordered_set type, safe_fixtable/2 is not
necessary as calls to first/1 and next/2 will always succeed

Preparing to rework the pipelining algorithm

Verified that all code paths using saved table
identifier from state are guarded either by a
check for undefined or a call to maybe_create_ets,
so the table should always be there when it
is needed without creating before real use.

For consistency, added macro aliases for remaining
ets table names to be found all in one place.

Reuse of ibrowse_lb for named table holding
load balancers and for name of unnamed table
holding connections was confusing.

Supports HTTP and HTTPS destinations and performs all hostname
resolution via the SOCKS proxy, preventing privacy leakage if used
with Tor.

If hostname is a valid IP address then it is used directly, the
hostname is not resolved again via the SOCKS5 proxy (Patch suggested
by Klaus Trainer but implementation here slightly different).

This reverts commit d8150feeaf.

Conflicts:
	.gitignore
	src/ibrowse_http_client.erl
	src/ibrowse_socks5.erl

if the option return_raw_request` was unset or false, ibrowse was
still returning the returning thhe raw request. This change fix it.
(Spotted while running couchdb tests)