Write PHPDoc
Fix a bug that it throws an exception when a passed log file does not exist

Check permission of a log file only when it exists
Fix the bug which checks permission even when file is not passed
Add tests
Add new test cases

Assert when set less buffer size than \Log\Buffered::MIX_BUFFER_SIZE
Assert when set more buffer size than \Log\Buffered::MAX_BUFFER_SIZE
Add fundamental tests
Add a lacked parameter 'file' at __construct()
Add the version
 Merge branch 'develop' into 'master'

Add tests

Add fundamental tests by PHPUnit. This change set includes the following modifications:

* Fix a bug that it throws an exception when a passed log file does not exist
* Checks permission even when file is not passed
* Add the version 0.0.1
Change the path to vendor libraries
Add composer.json
 Merge branch 'develop' into 'master'

Add composer.json

Composerlize the project.