WordPress share activity uses correct modal presentation style.

Show share activity via a popover on WPWebViewController on iPad.
Merge pull request #2156 from wordpress-mobile/issues/2153-share-activity-fix

WordPress share activity uses correct modal presentation style.
Updating localized strings.
Improves sanitizing featured image string.
Merge pull request #2161 from wordpress-mobile/issues/2157-featured-image-string-crash

Improves sanitizing featured image string.
Merge branch 'release/4.2' into develop
updates run-oclint.sh to allow for linting a file
Merge pull request #2181 from wordpress-mobile/feature/oclint_improvements

updates run-oclint.sh to allow for linting a specific file
Merge branch 'develop' into cleanup/anti-jank
removes reduntant conditionals
converts all tabs to four spaces