Add ant build.xml and ivy.xml

Since the ant build uses ivy to retrieve dependencies, ivy jar will need
to be copied to ~/.ant/lib
Partial commit with additional target for running tests using TestNG

Currently, some tests fail because the required excel files are not found.
More work is needed to fix the folder structure, run tests when executing
build target and produce jars.
Change folder structure to be similar to maven's

Update build file to reflect the changes. Still needs work:
1. build/run tests
2. release jar
3. etc.
Add/update targets to build sources, tests and run tests using TestNG
Fix .classpath for eclipse