ggcorr option: print correlation coefficients
ggnet option: support layout.par

this allows to pass complex graphing parameters (see sna::gplot.layout)
ggnet: labels at mid-edges
tiny example improvement
bugfix

remove useless warning
support for geographic networks
geographic coordinates, custom weights from network attributes
better geo option
bug
changed file name
merged in briatte-master
Merge branch 'dev' into briatte-master

* dev: (42 commits)
  changed file name
  added rJava binary
  Added a readme file
  added a travis file
  add roxygen2 to the suggests for documentations
  documented
  put example in if statement b/c depends on suggests.  added function locations
  shorten lines to comply with r cmd check
  updated the barDiag function to scale for continuous variables.
  Added ggally_histogramDiag.R
  git merge fix.  namespace now fixed
  no double import of ggplot2
  added backslash to work with new roxygen
  added news about removing ggsurv
  removed namespace of plyr::ddply.  already imported in general plyr
  fixed news
  updated news and description
  documented
  worked on imports of plyr, ggplot2, and reshape
  shortened ggnet example time
  ...
documented
added travis to r build ignore
updated docs to use link within code
added tnet to suggests
changed link to url
updated examples to use full arg name
added label.size to the params
added to vars to global check for r cmd check