Implement problem report disabling with comments in YAML source, for
instance:
# The following mapping contains the same key twice,
# but I know what I'm doing:
key: value 1
key: value 2 # yamllint disable-line rule:key-duplicates
or:
# yamllint disable rule:colons
- Lorem : ipsum
dolor : sit amet,
consectetur : adipiscing elit
# yamllint enable rule:colons
Closes: #8
