Merge pull request #15 from areynold/master

Closed quote on line 214 of build.sh
Fixed bug in custom image handler, and added workspace-manager.sh script to support multiple build trees
Merge branch 'master' of github.com:technosopher/OpenWRT-fastbuild
Full per-tree isolation (with respect to supporting resources such as downloads) + other refinements to workspace-manager script
Reordered intervention points to address two bugs/feature requests, and replaced exit instructions with stop and go commands
Must call cleanup routines as build rather than the calling user
Updated default clone source to reflect change from commotion-openwrt to commotion-router; minor cleanp
Remove populated TEMP_DIR before starting build to reduce space requirements
Added generalized build tree initialization script
Fixed faulty test
Added alpha version of new config bundle selector (replacement for current ./build.sh)
Cleaned up and debugged config bundle selector, and added error messages and sanity checks