Reworked Node Creation in TopBar
Link Creation in TopBar now comes with property-value fields; still some problems with topbar-instructions though
show full connection with source and target in instruction box
link optional fix ; node creation bar & syntax update / add parseNewSyntax
Visual fixes
Firefox fix: Firefox doesn't support svg fill-opacity apparently
Firefox fix
#toplink-instructions is no longer edited by LinkHover or Expander while a link is being created
Resolved merge conflicts
Fixed some bugs in TopBarCreate
Can now cancel link creation before target is chosen
Added url fields
Firefox compatibility,

Also getting rid of selecting text on graph so accidental selections on Shift don't mess something up
Merge pull request #127 from willzeng/topbarcreate

Refactor of TopBarCreate!
remove node size and color as defaults for topbarcreate
remove node size and color as defaults for topbarcreate
new nodes are now created in the center of workspace regardless of zoom/translation
dbl click on a node centers it and cntrl click selects the connected component
also center links on dblclick
bug fix on parsing link urls