Added to .gitignore, use full path to rebar3 script

.gitignore

@@ -2,6 +2,7 @@ _checkouts
 .rebar3
 rebar3
 rebar3.cmd
+rebar3.ps1
 _build
 .depsolver_plt
 *.beam

rebar3.ps1

@@ -1 +0,0 @@
-& escript.exe (Get-Item $PSCommandPath).Basename @args

src/rebar_prv_escriptize.erl

@@ -277,7 +277,7 @@ write_windows_scripts(Target, Wrappers) ->
 
 write_windows_script(Target, "powershell") ->
     CmdPath = unicode:characters_to_list(Target) ++ ".ps1",
-    CmdScript="& escript.exe (Get-Item $PSCommandPath).Basename @args\r\n",
+    CmdScript="& escript.exe \"$PSScriptRoot\\$((Get-Item $PSCommandPath).Basename)\" @args\r\n",
     ok = file:write_file(CmdPath, CmdScript);
 write_windows_script(Target, _) ->
     CmdPath = unicode:characters_to_list(Target) ++ ".cmd",