Merge pull request #51 from thescouser89/errata_proposal

Add version check in nvr (brew and mead) with the manually set version
inline bz editing + bug fixes + js refactoring
Merge branch 'master' of github.com:liweinan/ett
refactoring package edit package to use new js api+minor fixes on _errata.html
Add a cross to the brew column if it is not in the shipped-list
Add some legend to let user know what tick and cross mean
Preliminary fix for caching. Use some kind of russian doll caching

(Not really).

Switch the caching from a complete view to caching of each package listed in the
table in index.html. The caching of a package will 'expire' once the
'last_updated' column in a package is changed to something newer than it was
before.