JTR: add snippets model and migration. spec validates one to many relationship with topics.
JTR: snippet validates that it has content
JTR: snippets can be no longer than 255 characters
JTR: model and spec snippets
APS & JTR: added more controller tests for snippets
Merge branch 'master' into topic/snippet_relationship
Merge branch 'master' into topic/snippet_relationship
all tests working
fixed navbar and inherited JTR's body
Merge pull request #25 from gopher-snakes-2013/topic/snippet_relationship

Navbar is restyled and JTR's body is ready