v2.0.0-beta2 Release

This is the first public recommend version of PLog 2.0.
Important changes from 1.x:

• Split gradle dependency into multi artifacts, see Dependencies
• REMOVE Controller, Logger and maxLength configuration
• NEW: Printer interface to control output channel
• NEW: Style and SoftWrap feature customize support
• NEW: More flexible LogRequest class to present complicated logging calls
• NEW: Category interface to help filtering log #21
• NEW: Thread info is available
• NEW: Global exception try-catch, avoiding crash from library #24
• NEW: annotating many public methods with provided support annotations #21
• Totally redesigned sample app, it becomes more intuitive now #23

For Chinese documentation, migrating guide and other Q&As, please view Wiki.