Add utility functions to hit ChemSpider for CML creation.
Better comment.
Force the use of our chemical MIME-type mappings.

Both Drupal's and the OS's (Ubuntu) seem to map some incorrectly...
... like ".gam" files.
Changes based on code review.
Merge pull request #14 from adam-vessey/7.x-UC-14

Force the use of our chemical MIME-type mappings.
Merge pull request #11 from jordandukart/7.x-UC-16

Add utility functions to hit ChemSpider for CML creation.
Merge branch '7.x' of https://github.com/discoverygarden/islandora_solution_pack_chemistry into 7.x.indigo