Starting to add topic tags for grouping content.
I need to test this out in some of our publishers to see how this works practically.
Merge branch 'master' into adding_tags
Changing TopicTag to MetaData
Merge branch 'master' into adding_tags
Making a few more objects mettable.
Renaming some things to clarify their function.
Only validate Book#isbn on create.

Some books had to be imported from the old database without ISBNs
and we don't want those bio's to be always invalid so we'll only
validate Book#isbn on create.
Fix failing specs
Merge pull request #117 from biola/validate_isbn_on_create

Only validate Book#isbn on create.
Added a method to ensure that all groupings are parameterized
changed empty to blank
Merge pull request #116 from biola/adding_tags

Adding tags
Merge pull request #118 from biola/parameterize_groupings

Added a method to ensure that all groupings are parameterized
WCMS-288 Mounted uploader for banner on academic publisher
Merge pull request #119 from biola/academic_program_banner

WCMS-288 Mounted uploader for banner on academic publisher
Version bump to v0.42.0
Merge branch 'master' into features

* master:
  Version bump to v0.42.0
  WCMS-288 Mounted uploader for banner on academic publisher
  changed empty to blank
  Added a method to ensure that all groupings are parameterized
  Fix failing specs
  Only validate Book#isbn on create.
  Renaming some things to clarify their function.
  Making a few more objects mettable.
  Changing TopicTag to MetaData
  Starting to add topic tags for grouping content. I need to test this out in some of our publishers to see how this works practically.