Added tests

Conflicts:
	sunpy/lightcurve/tests/test_goes.py
Addressing comments
another bug fix
Fixed default data to more likely availability
fixed error conditions
fixed error codes
Fix backport regressions.
Modify changelog
Add test data to package, so tests run when installed.
Bump travis to latest pandas version.
Release 0.4.1
Merge pull request #1029 from Cadair/0.4

regression and test fixes for 0.4.1