Release v0.8.0 - MAGE-TAB format support

This release of isatools implements new MAGE-TAB format read/write capability, including import and export between MAGE-TAB and ISA formats (ISA-Tab and ISA-JSON).

• MAGE-TAB import to ISA #203
• MAGE-TAB export from ISA #124
• Fixes issues #101, #177, #191

For more information on the known issues with this release, please check the documentation at http://isatools.readthedocs.org