Testing the export-subst attribute in the .gitattributes file

File: Build/GramSchmidt.sh
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- Modified the 'release' section to eliminate an unnecessary "if" statement

File: .gitattributes
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- Added export-subst attributes to files and declared which files and
  directories are to have it unset

File: GramSchmidt_App/Makefile
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- Added the $Format:%cd$ string to test the export-subst attribute

File: GramSchmidt_App/src/GramSchmidt.cc
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- Added the $Format:%cd$ string to test the export-subst attribute