Bug fixes:
----------

* improve backwards compatibility with conda commands #1259
* only compile pyc files if python is in the build prefix # 1261
* remove exception catch-all in build CLI, to show actual errors more #1262
* specify full paths to activate scripts to avoid PATH conflicts with virtualenv #1266
* clean up remnants of pipbuild #1267
* remove pyc files from any source_files arguments to test in meta.yaml (avoid __file__ errors) #1272
* copy files and folders when breaking hardlinks (rather than renaming) to avoid cross-filesystem errors #1273
* add Scripts folder to prepended binary paths searched on Windows #1276
* update MACOSX_DEPLOYMENT_TARGET hard-coded value to 10.7 (better fix soon) #1278