Merge pull request owncloud#518 from owncloud/release-1.5.7

Release 1.5.7 - Hotfix for bug in release 1.5.6

Update version number to 1.5.6, 1.0.15(workaround)

release 1.5.5

Updated .gitmodules for easier access to ownCloud library from differ…

…ent environments

Submodule Library updated

Fixed version code in JB workaround app

Merge pull request owncloud#320 from owncloud/hotfix_layout_problem_i…

…n_login_while_landscape

Hotfixed layout problem in login while landscape

Fixed range of valid versions to install

Replace 'ownCloud' with reference to app_name

Release 1.4.6