add OS X deployment target to podspec

…cientific notation no longer borks parsing

Adds support for:
Q,q = Quadratic Bézier
T,t = Smooth quadratic Bézier

- Replace check if index == 0 and while statement into
`doesValenceMatch` method that produces more descriptive logging when
the parameters are insufficient
- Compute `[token command] == ` once per append command.
- Prevent Q and S control points from mixing
- Q and S use last point drawn as control if the previous command did
not produce a control point of that type.
- Move to point was producing a line after it moved to that point

- L style commands should have 2 parameters
- Fix logging on unichar

Support Quadratic Bézier paths

Bug fix for NSBezierPath. Wrong method signature :)

Preprocessor condition added so we can use the same file for building
and IB without modification.

dynamic Interface Builder compatibility

Carthage

updates

As per w3.org specs, you can ommit command character for repeated path instructions.
Example 1: C command followed by 12 numbers means two repeated C commands.
Example 2: M or m command followed by 2 or more pairs of numbers is a shortcut for LineTo
For more information see: https://www.w3.org/TR/SVG/paths.html#PathData

Changes:
- Support for multiple coordinate pairs after M/m command
- Support for multiple coordinate pairs to the L/l/H/h/V/v
- Support for multiple coordinate pairs to the S/s/C/c
- Support for multiple coordinate pairs to the Q/q/T/t

Added repeat instruction support

It was unused from what I could tell.