Write a Function for Parsing gene_exp.diff Files

[davebridges]

Should take two arguments, file and experiment_id.

The file should be parsed and generate a new record for each datum. If a gene does not exist in the database, a new gene record will be created.

The output should be a dictionary containing the number of new records created and the number of new genes created.

Error capturing should catch the following errors:

• Not a gene_exp.diff file
• The Experiment_id is incorrect
• Field errors.

[davebridges]

This is a smaller part of issue #5

[davebridges]

The experiment_id is validated in the form as part of 3e585e0

[davebridges]

Still a few potential errors out there:

• if the file is invalid.
• would like to output the number of records saved and new genes entered as a message
• ought to catch genes which are erroneously new.
• try to catch duplicate entries.