Linux fixes

[boehmseb]

This pull request contains fixes for the problems mentioned in #9 and #10.

In particular, the changes are:

• when determining the latest build, only consider subdirectories of the versions directory that start with BUILD_PREFIX
• new option for not using the support directory when launching starcraft
• after a starcraft instance is launched via the ControllerInterface, wait until the game is ready
• the existing method reachTheGame() now contains a fix for a bug that caused it to not wait between retries when the starcraft instance had not yet opened its socket

I tested these changes with the Linux packages for version 4.7.1 on a version of ocraft I backported to that protocol version. Configuring with S2Coordinator.setup() and launching with launchStarcraft() worked for both, singleplayer and multiplayer games.

[ocraft]

Great job! I'm releasing version 0.3.5 with this changes right now. Thank you for your contribution.