Fixed several typos
Long line wrap
Merge pull request #306 from alex/typo-fixes

Fixed several typos
Making changes as per dstufft's comments:

* renaming validate_and_normalize_package_name -> normalize_package_name for brevity
* removing unescessary db cleanup methods for db fixtures
* refactoring code that checks if a dictionaries keys match a tables column
* adding tests to ensure 100% coverage
Merge branch 'master' of https://github.com/pypa/warehouse into db_store_package