Update Gliese 687.xml

Added lastupdate
Source: http://arxiv.org/abs/1405.2929
Update HD 5608.xml

Added lastupdate
Source: http://arxiv.org/abs/1207.3141
Merge branch 'patch-21' of github.com:Sol-d/open_exoplanet_catalogue into Sol-d-patch-21
whitespace