changes path to lowercase in .lua

modulefiles/GCC/4.9.4.lua

modulefiles/GCC/5.4.0.lua

modulefiles/GCC/6.4.0.lua

modulefiles/GCC/7.2.0.lua

modulefiles/GCC/default

modulefiles/Java/1.7.0_21.lua

modulefiles/Java/1.7.0_71.lua

modulefiles/Java/1.8.0_151.lua

modulefiles/Python/2.7.13.lua

modulefiles/Python/3.6.1.lua

modulefiles/R/3.2.4.lua

modulefiles/R/3.4.3.lua

modulefiles/bcftools/1.7.lua

modulefiles/bedtools/2.25.0.lua

modulefiles/bowtie2/2.3.2.lua

modulefiles/bowtie2/2.3.4.1.lua

modulefiles/cdhit/4.6.8

modulefiles/cdhit/4.6.8.lua

modulefiles/deeptools/3.0.2.lua

modulefiles/fastqc/0.11.5.lua