Define options for lessc --include-path optparse.
Merge pull request #40 from bshelton229/bug/optparse-include-path

OptionParser::NeedlessArgument error with bin/lessc --include-path
updated to less v1.3.3
added newely-required library dependencies to environment
added new stubs
stubbed http concat of less files
Fix 'missing closing `}`' error on therubyracer 0.11.x.

Fix also works on 0.10.x. The newer version was prepending "Error:" to
the string which was breaking the check.

Also create the new exception using the original exception so we can
trace the original cause.
move development dependencies into Gemfile
Fix tests for less 1.3.3
Merge pull request #1 from avsej/v2.2.2-less1.3.3

Fix tests for less 1.3.3
Merge remote-tracking branch 'populr/v2.2.2-less1.3.3'

Conflicts:
	lib/less/java_script/v8_context.rb
v2.3.0