BUG: Index column is now the one named sample_name

The index column for sample and prep templates were being assumed to be
the first one in the file, this has been changed for it to be the
column named sample_name.
BUG: Add missing graph
BUG: Use read_csv in anticipation to deprectation
TST: Change #SampleID -> sample_name
STY: Fix PEP8s
Merge branch 'master' of git://github.com/biocore/qiita into do-the-panda
ENH: Centralize calls to csv parsing using pandas

Partially do the dinosaur with #449
BUG: Malformed import statement
Merge pull request #453 from ElDeveloper/do-the-panda

BUG: Index column is now the one named sample_name