OffsetArray constructor accepts Integer offsets instead of only Int ones

[jishnub]

Currently on master:

julia> OffsetArray(zeros(3), big(2))
ERROR: MethodError: no method matching OffsetArray{Float64,1,Array{Float64,1}}(::Array{Float64,1}, ::Tuple{BigInt})

After this PR:

julia> OffsetArray(zeros(3), big(2))
3-element OffsetArray(::Array{Float64,1}, 3:5) with eltype Float64 with indices 3:5:
 0.0
 0.0
 0.0

Also change the error type in overflow checks from ArgumentError to OverflowError.

[codecov]

Codecov Report

Merging #188 (171144a) into master (94a4172) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   98.91%   98.92%           
=======================================
  Files           5        5           
  Lines         277      279    +2     
=======================================
+ Hits          274      276    +2     
  Misses          3        3           

Impacted Files	Coverage Δ
src/OffsetArrays.jl	98.93% <100.00%> (+0.01%)	⬆️

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