NOT operator support. Fixes #30
README update
Fix WHERE IN indentation (with simple test)

Previously was

    SELECT * FROM `cb_my_table` WHERE `foo` IN (1, 2, 3)AND `bar` = 'baz'

Note AND operator.
Merge pull request #31 from neoascetic/features/not-operator-support

NOT operator support. Fixes #30
Merge branch 'neoascetic-fixes/fix-where-in-indentation'
Rollback some merge changes. Close #34
Merge branch 'master' of github.com:usmanhalalit/pixie

Conflicts:
	tests/Pixie/QueryBuilderBehaviorTest.php
Ignore limit and offset for count. Fix #33
ON DUPLICATE KEY statement support
updated README.md and test case for onDuplicateKeyUpdate()
Merge pull request #36 from nicronom/on-duplicate-statement

On duplicate statement
Add whereNull, whereNotNull, orWhereNull, orWhereNotNull methods. Close #35