Adding the hek2vso module
Updated documentation to the hek2vso module
Removed unnecessary/redundant methods
moved progress_bar function from hek2vso module and created a module in the sunpy.util directory
adding WSDL parser functions
__init__ update
fixed minor data-type error and fixed errors in the __init__ files I wrote.
polished the parser module and began fleshing out the hec module. Currently returns a beautiful VOtable obejct containing the hec table names for a query.
Added: function to convert time objects to format supported by the HELIO WSDL service, filled in the time_query method, created a method to prompt user with a choice for table names and feeds it into the HELIO service, plus a couple other smaller methods to clean and format results
Added documentation
tidy up branch
Merge pull request #725 from Cadair/HEK_and_HELIO

Fix the HEK_HELIO branch
Merge pull request #730 from Cadair/HEK_and_HELIO

move weird helioviewer import
move weird helioviewer import
replace helioviewer import in net __init__
Merge pull request #731 from Cadair/HEK_and_HELIO

replace helioviewer import in net __init__
Merge remote-tracking branch 'origin/master' into HEK_and_HELIO

Conflicts:
	sunpy/net/helioviewer.py
add API docs
Merge pull request #738 from Cadair/HEK_and_HELIO

add API docs
make self_test not import if pytest is not installed