moved both templates to use underscores

diff --git a/letter-template/Makefile b/letter_template/Makefile
similarity index 100%
rename from letter-template/Makefile
rename to letter_template/Makefile

diff --git a/letter-template/text.tex b/letter_template/text.tex
similarity index 100%
rename from letter-template/text.tex
rename to letter_template/text.tex

diff --git a/paper-template/Makefile b/paper_template/Makefile
similarity index 100%
rename from paper-template/Makefile
rename to paper_template/Makefile

diff --git a/paper-template/mako-mem.sty b/paper_template/mako-mem.sty
similarity index 100%
rename from paper-template/mako-mem.sty
rename to paper_template/mako-mem.sty

diff --git a/paper-template/refs.bib b/paper_template/refs.bib
similarity index 100%
rename from paper-template/refs.bib
rename to paper_template/refs.bib

diff --git a/paper-template/text.tex b/paper_template/text.tex
similarity index 100%
rename from paper-template/text.tex
rename to paper_template/text.tex