Add linear referencing methods to linestring

[jericks]

Hi Justin!

This pull request adds a few linear referencing methods to the line string geometry class.

Thanks!
Jared

[jdeolive]

Looks good Jared. One thing I might change is to allow the methods to accept all the forms of a point that the Point class constructor takes. Should be easily able to do that just by invoking the Point constructor as the first thing in the methods.

[jericks]

Hi Justin! Does this look good? I modified it so you can pass in a Point or a variable list of coordinates:

point = line.placePoint(Point(1153461.34, 649950.30))
or
point = line.placePoint(1153461.34, 649950.30)

Thanks,
Jared

[jdeolive]

Looks great!

[jericks]

Hi Justin!

Is this ok to merge?

Thanks,
Jared

[jdeolive]

Oops, sorry Jared. Definitely good to go.