allow for space and equal char in key name when in quotes
added some pod

- description
- export
- subroutines:
    - new
    - feed
extending pod

- added Returns section to new and feed
- added pod skeleton to every method of Ini::Parser
pod improvemnts

- moved description from arguments items to new lines
- added documentation for method merge
pod improvements - added section method docs
pod - sections method
pod - is_parsed method
added skeletons of pod for Ini::Parser::Error methods
supplemented files list
pod improvements

- removed returned value name from Returns section of documentation
- added documentation for process_instruction
pod - for const Ini::Parser::MAX_FEED_FILENAME_LENGTH and whole Ini::Parser::Section class
order of values from Ini::Parser::Section::keys and ::values corresponds to each other
pods for Ini::Parser::Error
many pod improvements

- added working links
- better structure