should use full names of arguments to avoid the "partial match" warning in R CMD check
need to escape \ in arguments as well
Merge pull request #133 from yihui/full.names

use full names of arguments
a test case and news item for escaping \
Merge pull request #134 from yihui/escape-backslashes

Escape backslashes
add test to cover existing behavior
add failing parts of the test
template with extension .r are supported on case-sensitive file systems
update NEWS