Rnc

Searching with gramm params fixed – Issue 3 closed.

Changed
* Parsing structure corrected.
* `is_http_request_correct` and `whether_result_found` joined, amount of operations deteriorated.
* Order of receiving pages corrected.
* Corpus init divided: `_from_file`, `_from_Corpus`.

Added
* ParallelCorpus.
* Adding found wordforms to the Corpus initting from file.

Changed
* Marking found wordforms with `re`.
* Logging simplified.
* Exceptions catching and evaluating.
* Some methods became static.
* `__repr__` and `__str__` methods in `Example` and `Corpus`.
* Ex_type init fixed.
* Docs corrected.
* Now one can dump data to files even if they exist.


Added
To `Corpus`
* Set classmethods.
* Clear function.
* NotImplementedError in `Corpus._parse_doc`.
* Setitem method.
* `Restrict show` param: by default Corpus shows in print 50 examples.
One can change this param or turn the restriction off.


To `__init__`
* Func to set stream_handlers levels.
* Func to set file_handlers levels.
* Func to set loggers levels.

To `Example`
* `data` property, more changes with this.
* Setter methods.

Added
* `Paper2000Corpus`.
* `PaperRegionalCorpus`.
* `DialectCorpus`.
* `SpokenCorpus`.
* `AccentologyCorpus`.

First release
* `MainCorpus`.