added some ide project setting files to ignore
Merge branch 'd/update-.gitignore' of https://github.com/doneill/geometry-api-java into doneill-d/update-.gitignore

Conflicts:
	.gitignore
changed the folder structure
Merge pull request #37 from Esri/mavenize

changed the folder structure
Adding Interfaces to families of operators; permits much cleaner UDFs
* New interface IOperatorAWithB for (geom, geom) -> geom
* Applied it to Intersection, Difference, SymmetricDifference, and Union
More to come.
Minor fixes: error messages on import; gitignore artifacts; make NumberUtils available to UDFs
toString() on Geometry and OGCGeometry
CombineOperator replaces IOperatorAWithB.java
Merge pull request #42 from mrflip/operators_have_interfaces

Families of operators have common interfaces
Merge pull request #3 from Esri/master

merge repo