update link for all modules names to lowercase

src/singularity_modules/bedtools/2.25.0/build.sh

 #/bin/sh
-sudo singularity build --force bin/bedtools:2.25.0.sif src/singularity_modules/BEDtools/2.25.0/BEDtools.def
+sudo singularity build --force bin/bedtools:2.25.0.sif src/singularity_modules/bedtools/2.25.0/bedtools.def
 singularity sign bin/bedtools:2.25.0.sif

src/singularity_modules/bowtie/1.2.2/build.sh

 #/bin/sh
-sudo singularity build --force bin/bowtie:1.2.2.sif src/singularity_modules/Bowtie/1.2.2/Bowtie.def
+sudo singularity build --force bin/bowtie:1.2.2.sif src/singularity_modules/bowtie/1.2.2/bowtie.def
 singularity sign bin/bowtie:1.2.2.sif

src/singularity_modules/bowtie2/2.3.4.1/build.sh

 #/bin/sh
-sudo singularity build --force bin/bowtie2:2.3.4.1.sif src/singularity_modules/Bowtie2/2.3.4.1/Bowtie2.def
+sudo singularity build --force bin/bowtie2:2.3.4.1.sif src/singularity_modules/bowtie2/2.3.4.1/bowtie2.def
 singularity sign bin/bowtie2:2.3.4.1.sif

src/singularity_modules/bwa/0.7.17/build.sh

 #/bin/sh
-sudo singularity build --force bin/bwa:0.7.17.sif src/singularity_modules/BWA/0.7.17/BWA.def
+sudo singularity build --force bin/bwa:0.7.17.sif src/singularity_modules/bwa/0.7.17/bwa.def
 singularity sign bin/bwa:0.7.17.sif

src/singularity_modules/urqt/d62c1f8/build.sh

+#/bin/sh
+sudo singularity build --force bin/urqt:d62c1f8.sif src/singularity_modules/urqt/d62c1f8/urqt.def
+singularity sign bin/urqt:d62c1f8.sif