v0.3.0: Parsing and Encoding

Access and modification of the low-level parsing and encoding system.

• Creates tokenizer for easier access to JSON parsing
• Creates encode for customization of JSON output
• Creates value::array_view and value::object_view for use in range-based for loops
• Creates the make install recipe (with customization of versioned SOs)
• Re-write of the parsing system to be stream-based so not everything has to reside in memory at the same time
• Expose string_ref as part of the encode and tokenizer systems
• Improved exception-handling in value
• Improved documentation, including automatic Doxygen generation with Travis CI