Fixes issue #6

[eliheuer]

Vertical metrics update, font-line output:

=== fonts/Staatliches-Regular.ttf ===
Version 1.000; ttfautohint (v1.8.2)
SHA1: 183eb0aa72c8ae4a5a88463bd96ce9c1056d7b1c

--- Metrics ---
[head] Units per Em:    1000
[head] yMax:        1006
[head] yMin:        -306
[OS/2] CapHeight:   696
[OS/2] xHeight:     500
[OS/2] TypoAscender:    950
[OS/2] TypoDescender:   -300
[OS/2] WinAscent:   1006
[OS/2] WinDescent:  306
[hhea] Ascent:      950
[hhea] Descent:     -300

[hhea] LineGap:     0
[OS/2] TypoLineGap:     0

--- Height Calculations by Table Values ---
[OS/2] TypoAscender to TypoDescender:   1250
[OS/2] WinAscent to WinDescent:     1312
[hhea] Ascent to Descent:       1250

--- Delta Values ---
WinAscent to TypoAscender:  56
Ascent to TypoAscender:     0
WinDescent to TypoDescender:    6
Descent to TypoDescender:   0

--- Ratios ---
(Typo Asc + Desc + Linegap) / UPM:  1.25
(winAsc + winDesc) / UPM:       1.31
(hhea Asc + Desc) / UPM:        1.25