Fix the sha checksum validation failure issue

• Fixed the checksum validation failure issues #10
• The implementation of v1.0.3 to v1.0.6 are the same, except v1.0.4 and v1.0.5 cannot be installed through npm install due to checksum validation failure, please don't use it as it is broken. though versions are being generated due to our try out of npm auto publish in the travis.

Version 1.0.3

• Bugs fixing for {numchar} lexical definition.

Remove fs and path dependency (Beta)

• Remove the fs and path dependency in package.json as they are standard package in nodejs.

Strict CSS Parser Support (Beta)

• Support the strict css parsing grammar for security filter to use.

Initial Stable Version 1.0.0

• Initial stable version of parsing css 2.1 and css 3.0 grammar.

please note that the grammar of css 3.0 is not yet completed.