Show source position of undefined setting.
Docs: removing remaining mentions of "~="
Make the DelegatingReporter aware of -nowarn

The test case compiles a project without and with this
setting and checks that a warning is and isn't emitted
respectively.

It's a multi-project build; this bug didn't seem to turn
up in a single-project build.
Docs: Remove leading $'s from scripts in Setup instructions
Docs/build: changes for CI doc refreshes
Include instructions for backspace key under cygwin (mintty)

Added note about setting in mintty to force sending of ^H which is necessary for the scala console backspace to work when jline.UnixTerminal is set and stty erase is ^H.  Additional documentation for #562.
SBT Scage Plugin added
Use sbt 0.13.0 to build the 0.13 branch.
Update versions in CONTRIBUTING
Docs: phase out mailing list as a support channel
Convert -classpath to CLASSPATH when forking on Windows and length exceeds a heuristic maximum.  Fixes #755.
Attempt to improve key collision error message
Move some logic in custom pom parser to separate methods
do custom pom processing when reading from cache, fixes #876
don't transform a module descriptor after it has already been processed by this sbt version.  Ref #876.
parse external pom.xml with CustomPomParser to handle multiple definitions.

Fixes #758.  This is the same issue fixed by 74c07c64a78447274be47804a6f5f5019c571dab
but in this case the cause was the top-level pom.xml, which didn't go through CustomPomParser.
Extra access methods for IPC
Recover from failed 'reload' command in the scripted sbt handler.
Pending test case for #805.
Docs: clean up Getting-Started/Basic-Def, including an example of defining a key.  Fixes #862.