Skylark

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- Fix 32 in 33.

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Add:

- Support for field/function/sql on the right side of an expression
- Support for custom operator (like bitwise operators)
- Support for sqlite3.
- Ability to set DBAPI.
- Transaction
- join methods: `User.join(Post)`, ..
- method `Database.set_autocommit`

Non-compatiable Changes:

- select-result.one()/all() return only instances of models
- fetch function/expression result from selectresult by method tuples()
- remove method dicts() from select-result

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- Close cursor on each execution

- Close connection on Database deled

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- Rename `curd.py` to `skylark`

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- Prefer to use the C DBAPI(MySQLdb), then PyMySQL

- Support for Python3.x (>=3.3)

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- Fix bug: issue12, select statement with where syntax without priority

- SelectResult: `findall()` => `all()`, `findone()` => `one()`

- SelectResults: add `tuples()`, `dicts()`

- Removed `distinct()`, add keyword `distinct` (implemented as a type)

- Retrieving data way: inst; inst, func; func

- Add class `sql`, to declare a literal sql

- Lots of minor bugs fixed.