Versioning specificity (JuliaData#1015)

* Compat minimum version is 0.8.0 for show/writemime and unsafe_string

* Be specific about print_escaped renaming

for the sake of bisecting
ref JuliaLang/julia#16603

* Remove probably-unnecessary at-static

Author: tkelman

REQUIRE

@@ -4,5 +4,5 @@ StatsBase 0.8.3
 GZip
 SortingAlgorithms
 Reexport
-Compat 0.7.19
+Compat 0.8
 Docile

src/abstractdataframe/io.jl

@@ -8,7 +8,7 @@ function escapedprint(io::IO, x::Any, escapes::AbstractString)
     print(io, x)
 end
 
-@static if VERSION < v"0.5.0-"
+if VERSION < v"0.5.0-dev+4354"
     function escapedprint(io::IO, x::AbstractString, escapes::AbstractString)
         print_escaped(io, x, escapes)
     end