Merge pull request #422 from hpcugent/develop

release EasyBuild v1.13.0
Merge pull request #440 from hpcugent/develop

release EasyBuild v1.14.0
Merge pull request #474 from hpcugent/develop

release EasyBuild v1.15.0
Merge branch 'v1.15.x'
Merge branch 'v1.15.x'
extra paths for LD_LIBRARY_PATH, LIBRARY_PATH and PKG_CONFIG_PATH
added also "lib" to guesses
style fix
Merge pull request #495 from pescobar/R_ld_library_path

R ld library path