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/colon_equal.liga.xml

@@ -1,19 +1,20 @@
-<Glyph name="colon_equal.liga" lsb="-450" width="625">
+<Glyph name="colon_equal.liga" lsb="-442" width="625">
     <CharString>
-        126 183 60 183 hstem
-        -450 907 vstem
-        -243 369 rmoveto
-        3 183 rlineto
-        -207 hlineto
-        -3 -183 rlineto
-        876 157 rmoveto
-        -566 -132 566 hlineto
-        -669 -268 rmoveto
-        3 183 rlineto
-        -207 hlineto
-        -3 -183 rlineto
-        876 158 rmoveto
-        -566 -132 566 hlineto
+        126 183 -157 132 85 183 -158 132 hstemhm
+        -441 206 hintmask 01011000
+        -128 152 rmoveto
+        566 132 -566 hlineto
+        110 vmoveto
+        566 132 -566 hlineto
+        hintmask 10101000
+        -107 -400 rmoveto
+        2 183 rlineto
+        -208 hlineto
+        -1 -183 rlineto
+        207 243 rmoveto
+        2 183 rlineto
+        -208 hlineto
+        -1 -183 rlineto
         endchar
     </CharString>
     <Subrs/>