Improving test coverage, doi badge, fix read_fhx blank space bug

[chguiterman]

Also includes:

• A minor fix to read_fhx() for flexibility
• A minor edit recommended R CMD check
• Add DOI badge to README

[coveralls]

Coverage increased (+16.6%) to 92.549% when pulling b18414a on chguiterman:master into 0cb419d on ltrr-arizona-edu:master.

[brews]

Hey @chguiterman! Thanks for the code!

Are you ready for a review on this PR?

Could you walk me through your "A minor fix to read_fhx() for flexibility"... How did you come across this? What happens, exactly?

[chguiterman]

Hey @brews
Yes, please review and merge if there's nothing to further correct.
The "minor fix to read_fhx()" was to tell burnr to ignore blank spaces at the end of an FHX file. I encountered some read-in errors upon loading IMPD files that this fixes. The added code was inserted in line 126 of "io.R" where we drop the dots (".") from the series. Sometimes there's a blank line after the last ring, and "\032" is the ASCII code for a blank.

[brews]

These changes generally look good. Really happy to see coverage improve, @chguiterman! Thanks so much for this PR.

Given the time crunch I'm fine to merge this but I created new issues to

• update NEWS.md (Update NEWS.md #163)
• add a unit test for the FHX file whitespace problem (Add read_fhx() unit test for whitespace at end of file #164)

These need to be taken care of before our next release.