Renamed JunitFormatter into JUnitFormatter
Created a simple JUnit formatter

Although it does not handle advanced data, it is JUnit xsd compliant!
[JUnitFormatter] Added information on the testcase nodes
[JUnitFormatter] Store the exception when example is broken
[JUnitFormatter] Display exception trace on broken example
[JUnitFormatter] Display exception trace on failed example

Escaped exception trace and message to avoid messing junit xml
[JUnitFormatter] Added attributes on testsuite nodes

Added "time", "failures", "errors" and "skipped" attributes
[JUnitFormatter] Escaped exception message special chars
[JUnitFormatter] Added xml header
[JUnitFormatter] Fixed incorrect spec
[JUnitFormatter] Added attributes on the testsuites node

Added "time", "tests", "failures" and "broken" attributes
[JUnitFormatter] Added PHP doc
[JUnitFormatter] Fixed indentation
[JUnitFormatter] Ensured PHP < 5.4 compatibilty
[JUnitFormatter] Ensured compatibility with HHVM

ENT_XML1 constant is undefined in HHVM
[JUnitFormatter] Fixed typo
Merge pull request #277 from gquemener/feature/valid-junit-format

Added a valid JUnit Formatter