Strip the leading sign when printing a positive first term coefficient.
Merge pull request #21 from stepthom/anshubranch

Fixed issue #12 by having the createFraction function take a second para...
refactored to increase maintainability

toString() now calls formatString(false) rather than duplicating it's
logic.
refactor and fraction mode fix

refactored to improve readability/maintainability.  prettyPrint() now
calls new function formatString() rather than toString().  allows
coefficient to be printed without the positive sign rather than needing
to strip it after the fact.
add xml output option

now accepts -x specifying xml output
comments
Merge pull request #22 from stepthom/Remove-leading-plus-sign

Strip the leading sign when printing a positive first term coefficient.
fixed formatting to include <function> element

fixed xml output to make <output> and <derivative> correctly
subelements of <function>
Merge pull request #24 from stepthom/Create-xml-output

Create xml output
Fixed Fraction.subtract function
Added unit tests to verify fix of issue 25 (Fraction subtract). Unit tests fail with old code and work with new code.
Added FractionTest.java file
Merge pull request #26 from stepthom/anshuissue25

Anshuissue25
Fixed merge conflicts
added differentitate test file