Updated format bar icons and updated demo project.
Updated add image format bar icon to latest version.
Merge branch 'release/0.3' of github.com:wordpress-mobile/WordPress-iOS-Editor into issue/397-icon-updates

# By Sérgio Estêvão
# Via Sérgio Estêvão (1) and Sérgio Estêvão (1)
* 'release/0.3' of github.com:wordpress-mobile/WordPress-iOS-Editor:
  Update pod spec version number to 0.3
  Only offer to remove images that have an a id.
  Add remove image method.
Pod update
fixed podspec
Merge pull request #434 from wordpress-mobile/issue/397-icon-updates

Updated format bar icons and updated demo project.