Updated srcds package docstring
Initial commit for package manager
Implemented package downloader
Added path builder for package
Implemented package extractor and installer
Added package for SteamCMD
Fixed default installation path not respected
Fixed wget output file command-line switch specified incorrectly
Refactored SteamCMD wrapper to use our new package manager
Merge branch 'feature/package' into develop

Conflicts:
	srcds/steamcmd.py
Added prefix for temporary files