Add ProjectRun and ProjectRunList commands

Since https://github.com/ervandew/eclim/pull/177 seems to be abandoned, this is my attempt at picking up where he left off. 

`:ProjectRun` will execute the first-found launch config for the current project
`:ProjectRunList` will list all launch configs and their type for the current project

I've only used this with Android projects, but I think works very well. For other projects that run in a console inside of Eclipse, it may be possible to hook into the `ILaunch` to dump output, terminate launches, etc. Not sure if that is necessary for this PR or not.

The commands work well in both headless mode and headed.