add Day Calendar and Gregorian Calendar. But there are no proper tests
yet.
Squashed commit of the following:

commit 5c970d24c74f6e94bc4753f5e97bad77b3f58d6c
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Mon Nov 18 08:19:33 2013 +0100

    what ever

commit fd6b12c2ab3bc5ed4c88334ba5ab80391cc8748e
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Mon Nov 18 08:17:56 2013 +0100

    time is now unix time again

commit efaaff768b1f175d645a6f05fbb04b6753fce187
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 11:36:35 2013 +0100

    docu

commit c674ccb1ed7877487773d3521d283cb3f66c8eed
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 11:35:26 2013 +0100

    fixed that problem, but now its for some reason bad

commit 3eb92810dd05818c5a30e1c2ae59fe6e171b7198
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 11:30:15 2013 +0100

    there is something wrong with the day transformation

commit ce9d0dd0cac1afe1ce526772fc6d6eede37bac19
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 09:23:19 2013 +0100

    awesome now it works

commit 3f7ffe3b937ecb9a0541f651d664ffd0903baa25
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 07:35:39 2013 +0100

    i should work with a class between Date and Gregorian

commit ecf40d6f0980104802b4a2486b085a6e3d5f1a80
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 07:32:00 2013 +0100

    looks like we tricked it

commit 185ba628a35740498caa8ee74f62b7b67a3a7065
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 07:27:15 2013 +0100

    looks like we tricked it

commit a3a30143f3745e28aa3851a7fcc31a1b1717d377
Merge: 677c84d 27096c9
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 07:13:04 2013 +0100

    Merge branch 'day'

commit 677c84d01edbee5245bea240d1cad998e59be21e
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 07:09:54 2013 +0100

    Gregorian Calendar Tests fail

commit 27096c9622c999e86706d7667b4bcf318b2df6e9
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Sun Nov 17 06:53:04 2013 +0100

    gregorian finished? now tests

commit 02722d3f6a55dbbeb1317278fec1c0ef7cf629b7
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 11:04:17 2013 +0100

    important note

commit 8ae96b4fa7573a20033193862c422e0b4663922e
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 10:55:47 2013 +0100

    still transformation stuff

commit 1f2b1e9d97ff916695dc701a6f8c6250388ba34c
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 10:52:26 2013 +0100

    still transformation stuff

commit d28459c772e59a8b55686ecd50862840c20085ee
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 10:18:07 2013 +0100

    on the gregorian day transformation

commit fd4ba05b09408468ad015d727fae3ee86a9964db
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 10:17:40 2013 +0100

    on the gregorian day transformation

commit a329a6e8b4a2828c9abea5ff8bbb094776f7d371
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 09:32:50 2013 +0100

    moar stuff for the gregorian calendar

commit 5002f19b44d85c02d989189f852be30157bee654
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 09:26:31 2013 +0100

    create gregorian calendar now

commit 417c5e4eee436db20b13f23b4accd0b7c5fd679f
Author: Ingolf Wagner <palipalo9@googlemail.com>
Date:   Fri Nov 15 09:11:10 2013 +0100

    add helper class for day calendar systems