add Dimension constant to Face class
add two constants to TemplateQuad (the number of all nodes, the number of base nodes)
test constants of Quad element
Renamed attributes in Face and TemplateQuad according to style guide.
Accessing dim and num of nodes via methods too.
Made test name more meaningful.
Added constants tests for quad8 and quad9 elem types.
Changes due to rebasing to recent master.
Removed the underscore in static variables in Face and TemplateQuad as requested by Karsten.
Added typedefs for Quad8 and Quad9.
Removed unnecessary includes.
Merge pull request #198 from norihiro-w/add-element-static-functions

Add constants to mesh element classes