Analysis object

[squirrelo]

Closes #42

Some functions commented out for later creation after the HMP2 deadline.

Added a function and test to the data base class to return filepath_ids for easier association with analyses.

[coveralls]

Coverage increased (+4.43%) when pulling 5aaf60c on squirrelo:addanalysis into 51cefe9 on biocore:master.

[teravest]

It says this one can't be automatically merged. Do you have a conflict?

[squirrelo]

Should be taken care of by the last commit.

[coveralls]

Coverage increased (+2.61%) when pulling 0e6934b on squirrelo:addanalysis into 2d75374 on biocore:master.