micro-optimization: replacing runInNewContext with runInContext which seems to be 200x faster when using a static context
removed shelljs
Merge pull request #881 from drewfish/no-shelljs

removed shelljs
Merge branch 'develop' of github.com:yahoo/mojito into micro-optimization-startup
Merge pull request #863 from caridy/micro-optimization-startup

micro-optimization: replacing runInNewContext with runInContext:

- runInContext seems to be 200x faster when using a static context, and this is suppose to help with apps with many files, improving the start up time during "mojito start", and apps with many tests during "mojito test" command.