Merge pull request #37 from allegro/release-1.8.1

Release 1.8.1
Bumped version to 1.9.0
Remove simple json import for compatibility with Django>=1.5
Merge pull request #41 from quamilek/remove-simplejson

Remove simple json import for compatibility with Django>=1.5
Merge pull request #39 from allegro/release-1.9.0

Release 1.9.0
Merge pull request #40 from allegro/release-1.9.0

Bumped version to 1.9.0
Fix for 'show all items on a single page'.
Merge pull request #42 from xor-xor/pagination

Fix for 'show all items on a single page'.
Fixed mismatched thead/tr tags in 'table_header.html'
Merge pull request #45 from xor-xor/table_header

Fixed mismatched thead/tr tags in 'table_header.html'
Bumped version to 1.9.1
Merge pull request #44 from allegro/release-1.9.1

Bumped version to 1.9.1
Merge branch 'master' of github.com:allegro/django-bob