Added HD 156846 b as controversial.

Orbital/stellar parameters:
Kane et al. (2011): http://adsabs.harvard.edu/abs/2011ApJ...733...28K
Reffert & Quirrenbach (2011): http://adsabs.harvard.edu/abs/2011A%26A...527A.140R

Binary separation and position angle:
WDS: http://vizier.u-strasbg.fr/viz-bin/VizieR-S?WDS%20J17206-1920B

Secondary mass and spectral type:
Tamuz et al. (2008) http://cdsads.u-strasbg.fr/abs/2008A%26A...480L..33T

Coordinates:
SIMBAD: http://simbad.u-strasbg.fr/simbad/sim-id?Ident=CCDM%20J17206-1920%20A
Coordinates from SIMBAD
HD 156846: added inclination and ascending node
Reffert & Quirrenbach (2011): http://adsabs.harvard.edu/abs/2011A%26A...527A.140R
Merge pull request #407 from ajtribick/hd156846

Added HD 156846 b (controversial)
Update 75 Cet.xml

Added lastupdate
Source: http://arxiv.org/abs/1207.3141
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 pull request #408 from Sol-d/patch-20

Update 75 Cet.xml
Merge branch 'patch-21' of github.com:Sol-d/open_exoplanet_catalogue into Sol-d-patch-21
whitespace
Merge remote-tracking branch 'oec/master'