Add setup_eunit rebar command

This adds a rebar plugin that introduces the setup_eunit function to
bootstrap the test ini files necessary to run the eunit test suite. It
grabs the ini template files from rel/overlay/*.ini primarily to be
able to set an absolute path for data directories and the prefix based
on the location of the CouchDB source directory.
Set the BUILDDIR environment variable for use in eunit tests
Disable problematic tests
TMP: use 1963-eunit-bigcouch branches
TMP: enable verbose eunit output
Fix NOTICE whitespace
Add NOTICE info for ?assertNotMatch macro
Merge remote-tracking branch 'origin/1963-eunit-bigcouch'
skip folsom test suite
fix makefile target dependencies
create couchjs where eunit expects it
remove lies