Update RETableViewItem.h

add handler for nav button on ActionBar.
Update RETableViewCell.m

add handler for nav button on ActionBar.
Merge pull request #132 from mrdaios/master

RETableViewItem block add.
Update RETableViewOptionCell.m
Ability to set custom header / footer height
Change run order
Version bump (1.5.8)
Fix DBL_MAX bug
Update RETableViewManager.podspec
Version bump (1.5.9)
Update README.md
Minor formatting changes
Merge branch 'master' of github.com:romaonthego/RETableViewManager