Initial commit. The first version is implemented.
[Tiny] flipflop.vim is moved to a directory named plugin.
Line feeds are handled properly.
Buffer height is incrementally tuned.
FlipFlop buffer is cleared for every redraw.
FlipFlop buffer name is made modifiable.
A meaningless line is removed.
FlipFlopOpenFlipFlopBuffer is introduced.
Vertical position of FlipFlop buffer is specified through a buffer name.

A new configure option named g:flipflop_buffer_align_topof is
introduced. The flipflop buffer will be put at the top of the specified
buffer, if that buffer is already opened.
Merge remote-tracking branch 'github/master'

The Licese description is added when the repository is made on github.