s/cogent.util.misc.app_path/bipy.app.util.which/g

Replace usage of ```cogent.util.misc.app_path``` with ```bipy.app.util.which```. Remove ```qiime.util.which```.

Related to #1369.
fix import spacing
Merge pull request #1379 from jrrideout/issue-1369-which

s/cogent.util.misc.app_path/bipy.app.util.which/g
added ability to change color choice - fixes #258
Merge branch 'master' of github.com:qiime/qiime into issue-258

Conflicts:
	qiime/make_otu_heatmap.py
	scripts/make_otu_heatmap.py
pep8'ing
added myself to credits, noted in changelog
Merge pull request #1386 from gregcaporaso/issue-258

fixes issue 258