Discourage use of libpng 1.2
convert pointer to integer before performing arithmetic

fixes mempool issues on platforms where sizeof(struct mempool) & ALIGN_MASK != 0
Tell libpng to expand all types to support RGB+tRNS images
Version bump
Removed unused function
Ability to write PNG file only up to predefined size
--skip-if-larger option
Add -msse2

Fixes #65
Less constness

Fixes #64
Make Q=100 really mean lossless

Fixes #63
Removed use of lib's private macro

#67
Add getters to libimagequant.c; add speed holder
Declarations for getters. Add return value.

This commit adds declarations for the getter functions added
previously and adds an omitted return value to one of the getters.
Merge pull request #71 from benkasminbullock/master

Add getters to the library
Add getters to manual
Document liq_get_max_colors
Add some things to the manual
Merge pull request #73 from benkasminbullock/master

Documentation of getters
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