Add small description of change in custom BCs
Add version added comment
Fix strict version number
Merge pull request #62 from mandli/chance-custom-BC-warning

Add small description of change in custom BCs
Update shallow water example name and fix gallery build instructions.
Merge pull request #63 from ketch/fix_pyclaw_gallery

Update shallow water example name and fix gallery build instructions.
Merge branch 'master' into release_5.2.1

* master:
  Update shallow water example name and fix gallery build instructions.
  Fix strict version number
  Add version added comment
  Add small description of change in custom BCs