Merge pull request #492 from am11/master

LESS: Import cause by drop has relative path
DropImage: Feature removed until it's ready
v1.7
SASS: Fixed validation filter
Image Paste: Removed unneeded constaint
CSS: Removed call to GetActiveFile()
ProjectHelpers: Made method private
LESS: Don't compile when no .css. Fixed #497
Node: Check target file out of source control
Img Optim: Removed trailing dots from status bar
Compilers: Fix #498

Some project systems don't like paths with forward slashes
Merge pull request #500 from SLaks/misc-fixes

Compilers: Fix #498