Self-lint false positive

[TotalVerb]

#179 currently causes a spurious self-lint error.

/home/fengyang/.julia/v0.5/Lint/src/dict.jl:16 E321 lexicalfirst: use of undeclared symbol
/home/fengyang/.julia/v0.5/Lint/src/dict.jl:16 E321 lexicallast: use of undeclared symbol

I have decided that it's best to disable the self-lint check in #179 until we can figure out why this is happening and fix it.

[TotalVerb]

The list of false positives / real problems has grown.

/home/travis/.julia/v0.6/Lint/src/statictype.jl:31 E321 EQ_METHOD_FALSE: use of undeclared symbol

/home/travis/.julia/v0.6/Lint/src/statictype.jl:31 E321 EQ_METHOD_FALSE: use of undeclared symbol

/home/travis/.julia/v0.6/Lint/src/statictype.jl:31 E321 EQ_METHOD_FALSE: use of undeclared symbol

/home/travis/.julia/v0.6/Lint/src/statictype.jl:43 I382 f: argument declared but not used

/home/travis/.julia/v0.6/Lint/src/statictype.jl:43 I382 argtypes: argument declared but not used

/home/travis/.julia/v0.6/Lint/src/variables.jl:179 W545 rhstype: previously used variable has apparent type Type{Any}, but now assigned Type{Type}

/home/travis/.julia/v0.6/Lint/src/variables.jl:190 W542 : comparing apparently incompatible types (#1) LHS:Type{Type} RHS:Type{Any}

/home/travis/.julia/v0.6/Lint/src/variables.jl:190 W542 : comparing apparently incompatible types (#1) LHS:Type{Type} RHS:Type{Any}

/home/travis/.julia/v0.6/Lint/src/variables.jl:171 I382 isConst: argument declared but not used

Some of these are real lint errors, not false positives, as indeed the arguments have been declared but not used. We should clean those up or add explicit ignores.