Added commons-exec library; also added jgit sources for javadoc
awesomenesss
Merge branch 'compilejar' of https://github.com/i4c8/ubc-cs410-xwing.git into compilejar
Merge branch 'compilejar' of https://github.com/i4c8/ubc-cs410-xwing.git into compilejar
Create commons-exec helper class, as well as test class for it. Also
added source JAR for jgit for javadoc awesomeness.