ENH: Add remote modules cmake files (Mosaic and otbGRM)

Modules/Remote/Mosaic.remote.cmake

+#Contact: Rémi Cresson <remi.cresson@teledetection.fr>
+otb_fetch_module(Mosaic
+  "This module provides one application dedicated to images mosaicking
+A more detailed description can be found on the project website:
+https://github.com/remicres/otb-mosaic
+"
+  GIT_REPOSITORY https://github.com/remicres/otb-mosaic.git
+  GIT_TAG 1406369c1ec9accffc0b3f40d0411e78bed2d893
+)

Modules/Remote/otbGRM.remote.cmake

+#Contact: Pierre Lassalle <lassallepierre34@gmail.com> 
+otb_fetch_module(otbGRM
+  "This module provides the GRM OTB application to perform multiscale
+region-merging segmentation on satellite images. Three local homogeneity
+criteria are available: the Baatz & Schäpe criterion, the Full Lambda Schedule
+criterion and the simple Euclidean Distance criterion.  This application uses
+the GRM (Generic Region Merging) library which allows to add quickly a new local
+homogeneity criterion. Look at the template header file: GRMSegmenterTemplate.h
+to see which format you must respect to add a new criterion.
+
+A more detailed description can be found on the project website:
+http://tully.ups-tlse.fr/lassallep/grm
+"
+  GIT_REPOSITORY http://tully.ups-tlse.fr/lassallep/grm.git
+  GIT_TAG 7762ef1f84154fcbaecba476ab9e0aba1bcd736c
+)