Merge pull request #1 from stevenlovegrove/master

GridCalibrator: Support for non rectangular targets and for missing grid observations
Fixed '-' bug in console.
typo: Jacobian.h --> Jacobians.h
Merge pull request #2 from strasdat/master

1 character patch ;-)
Updated grad.
Minor bug fixes.
Added inlines to use methods from more than one compilation unit.

Signed-off-by: Steven Lovegrove <stevenlovegrove@gmail.com>
Added 1D ESM

Signed-off-by: Steven Lovegrove <stevenlovegrove@gmail.com>