Feature/add maximum snow albedo option

[dgergel]

• [X] closes #834, see also #412 and #196
• [ ] tests passed
• [ ] new tests added
• [ ] science test figures
• [X] ran uncrustify prior to final commit
• [x] ReleaseNotes entry

This PR adds in a vegetation-dependent maximum snow albedo for new snow option called MAX_SNOW_ALBEDO. When set to True in the global parameter file, maximum snow albedo is read in from the parameters file and used throughout the snow routines for new snow albedo except for bare soil.

It also includes an unrelated bug fix to vic/drivers/shared_image/src/vic_restore.c which was necessary for being able to successfully compile the model.

[dgergel]

@jhamman here is a point simulation for a gridcell that is in Siberia, with ~60% grassland (max snow albedo of 0.7) and ~35% bare soil:

[dgergel]

@bartnijssen @jhamman I just took a stab at updating the unit test - not sure if this is the best way or not.