Add catalan translations
Merge pull request #213 from pokoli/catalan_translation

Add catalan translations – thanks @pokoli
Escape reserved caracters on catalan translation to do not break the build
Merge pull request #214 from pokoli/catalan_translation

Escape reserved caracters on catalan translation to do not break the build
SNI support for Android <4.2, too (see issue #9)
Version bump to 0.5.11-alpha
Retain unknown VCard properties, ez-vcard update, handle stale connections

* store unknown VCard properties in an extra column and load them when generating a new VCard (closes #118)
* upgrade to ez-vcard/0.9.3 (fixes sync error reported via Play Store)
* (re-)enable stale collection check, RetryHandler to retry idempotent CalDAV/CardDAV requests (hopefully fixes #225)
* always set FN/display name (take organization if no structured name is available) (hopefully fixes #227)
don't close httpClient while syncing
Read non-high-res photos, too (fixes #53 again); remove stale connection check because RetryStrategy should be enough
Version bump to 0.5.12
merge upstream
Minor improvments (timezone)