Merge remote-tracking branch 'kiliman/master' (#185)

* OperatorMonoSSm (Light, Book, Medium, Bold)
New Ligatures:
    - colon_colon
    - exclam_exclam
    - semicolon_semicolon
    - less_less
    - greater_greater
    - hyphen_equal (minus_equal)
    - asterisk_equal
    - slash_equal
    - less_slash_greater
    - less_less_equal
    - quotedbl_quotedbl_quotedbl
    - quotesingle_quotesingle_quotesingle
New Powerline Glyhps:
    - E0A1 (Powerline LN)
    - E0A2 (Powerline lock)
    - E0B1 (Powerline left soft divider)
    - E0B3 (Powerline right soft divider)

Features:
    - ss10 can be used to substitute 'x' for '×'. Eg 0×FF or 800×600
    - 'Equality Spaces' and 'Less-than/Greater-than Horizontal Bar' alternatives are included
    by default, and can be activated via ss11 and ss12 respectively.
    - Corrected and simplified features code to include the missing 'kern' feature for
    fraction numerator and denominator positioning.
    - 'calt.js' will also generate the 'liga' feature.

Edited and repositioned some existing glyphs to be more consistent across font weights.
Created missing glyphs for other weights. Eg 'w_w_w.liga' and 'plus_equal.liga'

* 'calt.js' no longer generates the 'liga' feature.

* Adjusted hinting, no contours changed.

ligature/OperatorMonoSSmLig-Bold/glyphs/less_bar.liga.xml

@@ -1,15 +1,15 @@
-<Glyph name="less_bar.liga" lsb="-348" width="625">
+<Glyph name="less_bar.liga" lsb="-342" width="625">
     <CharString>
-        -348 646 vstem
-        -348 396 rmoveto
-        -130 vlineto
-        497 -468 rlineto
+        -181 -21 216 -21 815 -20 hstem
+        197 145 vstem
+        -342 261 rmoveto
+        535 -463 rlineto
         149 1010 hlineto
-        -149 -12 rlineto
-        -356 -457 rmoveto
-        356 280 rlineto
+        -149 -12 -535 -405 rlineto
+        145 -71 rmoveto
+        14 vlineto
+        394 285 rlineto
         -626 vlineto
-        -356 332 rlineto
         endchar
     </CharString>
     <Subrs/>