Adding ability to pass inputs & parameters into pipeline using pom file.

- Added 'inputs' & 'parameters' configuration variables
- Since maven configuration doesn't allow maps of maps, parameters are declared as
  a map with the value being a '<key>=<value>' string
- Inputs have their URI constructed starting from the current working directory
Merge pull request #14 from usnavi/add_inputs_parameters

Adding ability to pass inputs & parameters into pipeline using pom file.