2.1

Updates/features:

• Add support for textAlignment to BONText and BONChain: #10, #67
• The description of BONText is now more informative, more internally consistent, easier to read, and is now covered by unit tests: #82
• Code is now formatted with clang-format: #83
• Updated for Xcode 7.1: #77

Bug fixes:

• Fixed crash when getting the attributed string from a BONText containing an empty string: #75 - thanks, @ateliercw
• Fix regression, which was added in #62, where concatenating text to an image would result in an errant \t character being inserted: #78