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updated readme
Merge pull request #10 from ryanvarley/develop

Error changes, some other small fixes and transittimes.
Merging branches together. The development branch is now master as the original catalogue has adopted standards decided on this one.

Merge commit 'a109f271e55555634c2a600d1cdee6ee9c5b8728'
Final change to bring the catalogue up to matching the original
Added Kepler-61. Source: http://arxiv.org/abs/1304.6726
Added KIC 4570949. Source: http://arxiv.org/abs/1304.6841
Added attribute checking to clean-up script.
Corrected typos.
Added new planets. Source: http://arxiv.org/abs/1304.6755
Merge branch 'master' of https://github.com/hannorein/open_exoplanet_catalogue
Added illustration for Kepler 61. Source: Joe Gallagher <nuc13arm00@gmail.com>
Merge branch 'master' of https://github.com/hannorein/open_exoplanet_catalogue
Merge branch 'develop'
HD149026b. Added transit time. http://dx.doi.org/10.1086/449306
HD 17156b. Added transit time. http://arxiv.org/abs/1011.0440
KOI-13b. Added transit time. http://dx.doi.org/10.1088/0004-6256/142/6/195
Added HD 41248. Source: http://arxiv.org/abs/1304.7374
Removed new tags.