loading datasets fails on v0.7

[tpapp]

julia> VERSION
v"0.7.0-beta.297"

julia> using RDatasets

julia> df = dataset("datasets", "iris") # load the dataset
Error encountered while loading "/home/tamas/.julia/packages/RDatasets/YIiZ/src/../data/datasets/iris.rda".
Fatal error:
ERROR: UndefVarError: is_installed not defined
Stacktrace:
 [1] checked_import(::Symbol) at /home/tamas/.julia/packages/FileIO/5FOv/src/loadsave.jl:24
 [2] #load#27(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::FileIO.File{FileIO.DataFormat{:RData}}) at /home/tamas/.julia/packages/FileIO/5FOv/src/loadsave.jl:175
 [3] load(::FileIO.File{FileIO.DataFormat{:RData}}) at /home/tamas/.julia/packages/FileIO/5FOv/src/loadsave.jl:167
 [4] #load#13(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::String) at /home/tamas/.julia/packages/FileIO/5FOv/src/loadsave.jl:113
 [5] load at /home/tamas/.julia/packages/FileIO/5FOv/src/loadsave.jl:113 [inlined]
 [6] dataset(::String, ::String) at /home/tamas/.julia/packages/RDatasets/YIiZ/src/dataset.jl:21
 [7] top-level scope at none:0

pkg> status
  [ce6b1742] RDatasets v0.4.0

(this is the second run, to suppress deprecation warnings)

[randyzwitch]

Please try the newest version of master just pushed, and if fixed, please close this issue

[randyzwitch]

Sorry, made a mistake...because of a pesky Julia error fixed in julia master, but not yet tagged into a 1.0.1 release, RDatasets isn't going to work on 0.7. But it does pass on julia master.

Up to you whether you want to leave this open, not sure that the julia master fix will get backported