trivial implementation of search keys
support for key_schema at the simple query and storage level
support for key_schema.types (castTo) and comparators (defaultMatch)
added some checks over key and key_schema objects
fixed getDay() -> getDate()
added key schema support to complex queries, fixed and added tests
custom keys: accent folding example
custom keys: respect naming conventions
custom keys: changed folding example with cast_to and wildcard support
JIODate type and tests
Custom operators: fallback to < and = when others are missing
(part of) documentation in sphinx format
docs: gid-storage
docs: added complex_queries, developers, gid_storage, naming_conventions
docs: download.rst
docs: typos, small fixes
docs: included built files
docs: transparent logo
docs: consistently use lowercase j in jIO
minor style and grammar tweaks