Improve backward compatibility with older R versions

• Fix to handle newlines in DESCRIPTION files
• Fix for non-utf8 environment

Ignore timeout errors on tests

Update documents for CRAN submission

• Support DESCRIPTION file with missing space between package name and version
  • e.g. pkg(>= x.y.z). It shoud be pkg (>= x.y.z) according to the document "Writing R Extensions".
• Remove PACKAGES.rds to avoid version mismatch
• Improve error handling

Initial release that was submitted to CRAN