Merge pull request #10 from alexeyknyshev/master

Fix examples
Captions can now have a fixed width
added linespacing fontsetting
Merge pull request #12 from Robert42/linespacing

Linespacing
Removed TODO line
Merge pull request #14 from Robert42/issue-13-remove-todo-comment

Removed TODO line
centering characters for monospace
centering characters also for the markup text
fixed rounding
Merge pull request #15 from Robert42/feature-center-character-in-monospace-fonts

Center character in monospace fonts
Merge pull request #16 from alexeyknyshev/master

Fix Rectangle::background_color(QuadCorner index, const Ogre::ColourValue& colour)
[TextureAtlas] getMarkupColour strict cv-qualifiers and avoiding copy
[Silverback] createScreen(Ogre::Viewport *viewport, TextureAtlas *atlas) API