"--universal" is propagated automatically to deps that define it
spatialite-gis: remove conflicting LDFLAG

Closes #709.
igraph 0.7.0

Update homepage to http://igraph.org.

Closes #711.
igraph: add test
gmt 4.5.12

Closes #712.
gmt 5.1.1

Add conflicts_with GMT 4, provided by gmt4 formula.
GMT build system has now moved to cmake.

Closes #473.
gmt4: move GMT 4 to new formula

Add conflicts_with current gmt.
Prior history for GMT 4 formulae preserved in gmt.rb
Batch convert http download urls from SourceForge to https

Corresponds to upstream audit changes. See Homebrew/homebrew#27041
fastx_toolkit: use resources
lp_solve: use resources
samtools: use resource
snid: use resources
openimageio: use resources
fwdpp 0.2.0 (new formula)

The 'fwdpp' template library abstracts the basic operations
required to implement forward-time simulations of population-
and quantitative-genetic models.

Closes #695.
bedops 2.4.1

Closes #713