Tests fail on v0.5

[Ranjan Anantharaman]

The latest master fails tests:

ERROR: LoadError: MethodError: no method matching length(::JDBC.JDBCRowIterator)
Closest candidates are:
  length(::SimpleVector) at essentials.jl:168
  length(::Base.MethodList) at reflection.jl:256
  length(::MethodTable) at reflection.jl:322
  ...
 in _similar_for at ./array.jl:225 [inlined]
 in _collect at ./array.jl:240 [inlined]
 in collect(::JDBC.JDBCRowIterator) at ./array.jl:236
 in include_from_node1(::String) at ./loading.jl:426
 in process_options(::Base.JLOptions) at ./client.jl:262
 in _start() at ./client.jl:318
while loading /Users/ranjan/.julia/v0.5/JDBC/test/runtests.jl, in expression starting on line 33

[Avik Sengupta]

collect in v0.5 seems to now require length implemented for an iterator.