Implement client-side caching of entity labels
Implement tree navigation block

Fixes EDOZWO-376, please run update script

Squashed commit of the following:

commit 3d22cdc44b23f14585ff236d2764f1b0fef6ebd5
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 15:43:26 2014 +0200

    Limit length of titles in tree navigation

commit 2af6d0a7e070cee30cf586c98c28f72bac0027b9
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 15:42:52 2014 +0200

    Enable tree block for all bundle types

commit d932ed66736ca971b1608b620d3e9c94a35084af
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 15:35:44 2014 +0200

    Add 'Cancel'-Button for parent management

commit dc35ebe2b1d73d6d7d113b333582c8b6ace1963a
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 14:54:59 2014 +0200

    Sort tree navigation lists

commit f26317de16a41da685d715e2c5cb6a99ed16cecc
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 14:54:34 2014 +0200

    Set CSS classes for parent management actions

commit 99ab47b14a0ddda07e62265e179062837b73aa66
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Tue Sep 23 14:50:19 2014 +0200

    Remove 'Children'-Tab

commit f695e11050848d8a68321e0291f7c97b1bf51605
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Wed Sep 10 20:18:13 2014 +0200

    Add parent management to tree navigation block

commit bfcca6f61af5784bd33116d67f54b7d0f7820815
Author: Felix Ostrowski <felix.ostrowski@googlemail.com>
Date:   Wed Sep 3 12:56:32 2014 +0200

    Implement tree navigation block