Added InjectorFactory to help integrating applications use Mycila, Governator etc.
Updated GuiceBundle constructor to save Stage variable
Added lifecycle management to Guice Injector
updated dropwizard version to 0.7.1
Merge with @anismiles commit '082e9c681377519b4fa19ade1849bdab76b80e65'

Conflicts:
	src/main/java/com/hubspot/dropwizard/guice/GuiceBundle.java
split out InjectoryFactory and default implementation into stand alone classes.
minor indentation change and set version to 0.7.0 to be consistent with current dropwizard-guice
reverted incorrect version update
updated formatting issues pointed out by pull request https://github.com/HubSpot/dropwizard-guice/pull/39/

also updated README with InjectorFactory instructions
removed public from interface method
Merge pull request #39 from yunspace/injectorfactory

Merging InjectorFactory pull request #18 after resolving conflicts