The ARM library was missing digital pin blocks, and the regular library had a reference to one
Added short descriptions to all the blocks
entypo web font
added quick add functionality to reference
small tweaks: max width for reference panel, change color when hover on term, change quickadd position
Cleanup of reference panel + loghub UI
Merge pull request #397 from jacqui/temp-master

Reference panel listing blocks
initial draft of linear modelling using stochastic gradient descent