Create a failure case when specifying dir/file
Fix TEMPFILE value to avoid creating /tmp/dir/file

Replace dir/file to dir-file
Create a failure case when inserting like ' text '
Modify to "$INSERT_TEXT" to avoid trim spaces
Remove *.swp from .gitignore
Create configure and Makefile.in

ref. https://gist.github.com/kaosf/e1bb6c035c5cfbc846c1

Ignore Makefile