Added secondary star of binary system and updated data from Queloz et. al (2000), Farihi et. al (2013) (http://dx.doi.org/10.1093/mnras/sts677), van Belle & von Braun (2009) (http://dx.doi.org/10.1088/0004-637X/694/2/1085), Mamajek and Hillenbrand (2008) (http://dx.doi.org/10.1086/591785)
Merge branch 'twam' into twam-merge

Conflicts:
	systems/Gliese 86.xml
Cleanup script now checks if there are duplicate tags
Updated readme.
Merge branch 'master' of https://github.com/hannorein/open_exoplanet_catalogue