Merge pull request #3 from kavacky/master

Various fixes
Merge pull request #4 from kavacky/master

display zero cents option
Merge pull request #5 from kavacky/master

euro plural fix
Merge pull request #6 from kavacky/master

example fixed
Merge pull request #7 from kavacky/master

Working with negative numbers
Merge pull request #9 from kavacky/master

fixed issue #8
Merge pull request #11 from kavacky/master

rounding error fix issue #10
Code cleanup
Merged master fixed conflict.