Merge pull request #55 from markdingram/master

Avoid a possible threading issue when multiple ScriptFactory created simultaneously
add maven-extension for the case a gem has an extension jar
[maven-release-plugin] prepare release jruby-maven-plugins-1.0.2
[maven-release-plugin] prepare for next development iteration
xml escape & on pom files
allow to use repository layout when including jars
just warn if the jruby.modes and the given jruby.version have no overlap
cover more cases of empty modes set
fixed one rspec IT
[maven-release-plugin] prepare release jruby-maven-plugins-1.0.3
[maven-release-plugin] prepare for next development iteration
less verbose per default
added feature to install a set of gems without any transitive dependencies
skip rspec if the specs directory is missing - fix issue related to https://github.com/torquebox/torquebox/commit/4901c49e45432f98a338bde7938103544652c91b
[maven-release-plugin] prepare release jruby-maven-plugins-1.0.3
[maven-release-plugin] prepare for next development iteration
get the rspec without spec dir right
[maven-release-plugin] prepare release jruby-maven-plugins-1.0.3
[maven-release-plugin] prepare for next development iteration
propagate env to each test run