Update changelog for release
Merge pull request #834 from wafels/0.4-docchanges-3

0.4 docchanges 3 to 0.4
Merge pull request #822 from Cadair/master

Update changelog for release
Add RELEASE announcement to 0.4
Change version for 0.4.0
Merge pull request #836 from derdon/dbtest-travis

travis tests (to 0.4)
Merge pull request #839 from sunpy/master

merge master into 0.4
Merge pull request #840 from sunpy/master

merge master into 0.4 2
Update setup.py
Merge pull request #838 from Cadair/0.4

This is 0.4