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/greater_equal.liga.xml

@@ -1,14 +1,13 @@
-<Glyph name="greater_equal.liga" lsb="-409" width="625">
+<Glyph name="greater_equal.liga" lsb="-414" width="625">
     <CharString>
-        -397 805 vstem
-        -355 -45 rmoveto
-        756 313 rlineto
-        129 vlineto
-        -763 311 -47 -129 589 -240 rlineto
-        -14 vlineto
-        -582 -243 rlineto
-        803 75 rmoveto
-        -803 -335 47 -127 756 313 rlineto
+        -179 -21 879 -20 hstem
+        223 184 vstem
+        407 393 rmoveto
+        -760 306 -61 -118 637 -240 rlineto
+        -17 vlineto
+        -637 -193 50 -122 774 267 rlineto
+        2 -68 rmoveto
+        -826 -286 50 -122 779 276 rlineto
         endchar
     </CharString>
     <Subrs/>