0.3.3 CRAN release

• Added examples and improved description according to CRAN reviewer comments.
• read.perseus no longer fails when the last entry of the #!{Description} line is empty
• Improved documentation so that devtools::check() runs through without errors.
• CRAN release and updated installation instructions

v0.3.0

• Manage additional martices (#4, @Sung-Huan)
• Parsing boolean parameters (#4, @Sung-Huan)