Added support for Dota 2 (bug 5640).
Fixed typo in AMBuild script causing Dota 2 bin to not attempt to build.
Removed loader's reliance on tier0 by manually parsing command line for -game (bug 5674, r=DS).
Added --sdks option to configure script to specify which SDKs to build againt (bug 5676, r=psychonic).

Valid arguments are "all", "present", or a comma delimited list of engine names.

The "all" option will try to build against all supported SDKs. (This is the default.)
The "present" option will only attempt to build against SDKs that exist on the system.

Examples:

configure.py --sdks=css,csgo,ep2v
configure.py --sdks=l4d
configure.py -s present
Triggering build.
Merge.
Triggering build.
Triggering build.
Triggering build.
Triggering build.
Triggering build.
Triggering build.
Added basic VDF file for easier installation (bug 5681, r=dvander).
Triggering build for CS:S filesystem changes.
Merge.
Build fixes for recent hl2sdk-dota updates.
Triggering a build.
Triggering a build.
Triggering build.
Merge.