Modify the first line of the LPC section of the README.md
Modify the USAGE section of the README.md.

Some grammar mistakes were fixed.
Added some periods left out.

NOTICE:
I think there may be some mistakes in the line 37. Why do we say 'use some
options *with* an executable'?
Delete .README.md.swp
Merge pull request #1 from RTNelo/master

Modify the README.md