Implement webhooks: https://bugzilla.redhat.com/show_bug.cgi?id=1122776

Squashed commit of the following:

commit bb4fc91c1650da1b3be9bd56aa75c1ff425082fb
Author: Alex Eng <aeng@redhat.com>
Date:   Mon Nov 3 14:44:37 2014 +1000

    Fix unit test

commit 21340690309ee09f3923124271fc3e99e4da7fa2
Merge: acfd4b9 89389da
Author: Alex Eng <aeng@redhat.com>
Date:   Mon Nov 3 14:36:25 2014 +1000

    Merge branch 'integration/master' into rhbz1122776

commit acfd4b98c185ea6eb6d2acc8a4bdbcd1ef570596
Author: Alex Eng <aeng@redhat.com>
Date:   Mon Nov 3 11:07:44 2014 +1000

    Implement asynchronous event for document statistic update

commit bfd4d8b1337df5ab0c53ac2954f7aa26d8f60f20
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 31 14:02:17 2014 +1000

    Revert org.zanata.model* to org.zanata.ui.model.* due to arquillian test

commit 4c549566988d59ed7d3a634077198a8ea9550695
Merge: 94138d5 d15e2d7
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 31 11:27:07 2014 +1000

    Merge branch 'rhbz1122776' of github.com:zanata/zanata-server into rhbz1122776

commit 94138d59290d8b81098d1ce8e32b49a8dccee848
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 31 11:25:34 2014 +1000

    Refactor org.zanata.ui.model.statistic to org.zanata.model.statistic, change webhook event to translated+approved and approved

commit 3e4b87c4fb0173c1fc057a1d926fb61d3d94af54
Merge: 0c97c6b c8facd7
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 31 11:06:46 2014 +1000

    Merge branch 'integration/master' into rhbz1122776

    Conflicts:
    	zanata-war/src/main/java/org/zanata/util/StatisticsUtil.java

commit 0c97c6bcf9b639c4edaa28e3dcb45fadb728e85f
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 31 11:05:24 2014 +1000

    Fix loading on webook, add message when removing webhook

commit d15e2d7704eaf716d73a0a2eb859a99ef5ab73fb
Author: Damian Jansen <djansen@redhat.com>
Date:   Fri Oct 31 09:42:30 2014 +1000

    Functional test for project webhooks

commit a13bc8faa98799508702323d6a33b6237f31dd8a
Merge: 0a13a33 240a396
Author: Alex Eng <aeng@redhat.com>
Date:   Tue Oct 28 10:35:44 2014 +1000

    Merge branch 'integration/master' into rhbz1122776

    Conflicts:
    	zanata-war/src/main/resources/db/db.changelog.xml

commit 0a13a3392ff22b3bf42118abc7412c20f3450874
Merge: 0822d48 11a9b5e
Author: Alex Eng <aeng@redhat.com>
Date:   Fri Oct 24 09:37:51 2014 +1000

    Merge branch 'integration/master' into rhbz1122776

commit 0822d48e8615effff5045efd71bea341c4b2e65c
Author: Alex Eng <aeng@redhat.com>
Date:   Wed Oct 22 13:29:24 2014 +1000

    Implement webhooks: https://bugzilla.redhat.com/show_bug.cgi?id=1122776