relicense from LGPL 2.1+ to EPL or LGPL 2.1+
Adds dual license information in README.md and poms.
add missing license comments

(the copyright of the individual authors is missing, but that's next
to impossible to determine reliably in an automated way.)
Merge pull request #2 from andlaus/change_license

Changes license headers in *.java to contain EPL/LGPL dual license
Merge pull request #62 from koppor/master

Adds EPL/LGPL dual license information