Merge pull request #21 from chrox/master

check if glyph is missing in current fontface
Add ability in einkfb.c to pass from 16bpp to 8bpp, this is useful on kobos.
Merge pull request #23 from giorgio130/master

Add ability to change bpp in einkfb.c
Update cre.cpp

Methods to get & set page margins in crengine
Merge pull request #24 from NuPogodi/master

Methods to get & set page margins in CREngine
Global settings for crengine

1. On making dummy document (function newDocView), crengine will try to read & apply settings from ./data/cr3.ini. If it founds nothing, it will create this file with defaults.
2. Function to save global defaults for crengine - saveDefaults. One may call this function either i) on the user's manual request or ii) everytime just before crengine closes document (so crengine will remember last configuration)
Merge pull request #25 from NuPogodi/master

Moving global settings for crengine to ./data/cr3.ini
use manual bbox in context for semi-automatic bbox finding