Merge pull request #190 from MaggieQi/master

remove array parameter from region_map so that it can use map_with_localtion directly
Merge pull request #191 from MaggieQi/master

fix random choose error when row-cost equals col-cost
Merge pull request #192 from MaggieQi/master

*fix some bugs when turning on optimization
sync with numpy's builtin: diagflat
sync with numpy's builtin: diag
Merge remote-tracking branch 'maggieqi/master'
Update comment: diag
Merge pull request #194 from MaggieQi/master

fix als node reuse error in the tiling optimization
Merge remote-tracking branch 'upstream/master'
Merge pull request #195 from MaggieQi/master

fix itembase_collab, lda, naive_bayes apps
Merge branch 'master' of git://github.com/GabrielWen/spartan into GabrielWen-master

Conflicts:
	spartan/expr/builtins.py
Merge branch 'GabrielWen-master'
Get workers' log back.
Add feature: dot with vector
Rewrite fuzzy_kmeans by using built-ins only.
Merge remote-tracking branch 'upstream/master'
Add power API
Merge remote-tracking branch 'upstream/master'
Merge with original dot_mapper
Merge pull request #196 from fegin/master

Get workers' log back