readability

Merge pull request #86 from eclarke/fix_83

Fixes for #77, #78, #82, #83, #84, and #85

Merge pull request #37 from idemockle/fix_na_limits

Fix case where user passes in NA upper and/or lower bounds

spelling

merged to 0.5.3

Merge pull request #15 from hrbrmstr/master

added source & issue URLs to DESCRIPTION

Examples updated for ggplot2

update Description