v0.6.8

add support for "Hack" font family (#309)

* testing hack font

* updates to allow font to be variable

* allow setting of font-family.  get initial font family from electron (needed for loading)

* add termfontfamily

* update wave logos for README

* hook up fontfamily setting, remove old dropdown active var

* get app to reload on font change.  reload fonts

* on termfontsize change, bump render version as well