* don't offer to install Tasks from InstallAppsFragment, show instructions instead
* fix crash when displaying "todo lists" heading in "selection collections" fragment (fixes#512, fixes#513)
* use Android SDK build tools v22.0.1
* account settings: show whether CardDAV server supports VCard 4.0
* CardDAV GET: ask for VCard 3.0 or VCard 4.0 (preferred) contacts
* CardDAV multiget: ask for VCard 4.0 contacts if the server supports it
* CardDAV PUT: send VCard 4.0 contacts if the server supports it
* import Apache httpclient-android rev. 1652769 correctly (hopefully fixes#491)
We can't use a repository version because there's no release yet which
contains rev. 1652769. However, this revision is necessary to get SNI with Android <4.2, too.
To avoid packaging a pre-compiled jar, this source lib has been added as a subproject:
apache-httpclient, branch 4.3.5-android, revision 1652769
Fixes#491.
