Bumped to v0.1.5

Added Travis button/indicator and lowered require to Julia 0.3
prerelease’s
Register CauseMap
Merge branch 'metadata-v2' of git://github.com/JuliaLang/METADATA.jl into metadata-v2
update requires with JSON
Merge branch 'metadata-v2' of https://github.com/cyrusmaher/METADATA.jl into metadata-v2
Preparing for Causemap release...
Register Helpme
Merge branch 'metadata-v2' of git://github.com/snotskie/METADATA.jl into metadata-v2
Tag Helpme v0.0.1
Tag Helpme v0.0.2
Tag Helpme v0.0.3
Register Gumbo
Merge branch 'metadata-v2' of git://github.com/JuliaLang/METADATA.jl into metadata-v2
Tag CPLEX v0.0.6
Merge pull request #984 from joehuchette/metadata-v2

Tag CPLEX v0.0.6
Merge pull request #985 from porterjamesj/pull-request/bf5b213f

Register Gumbo
Tag SymPy v0.2.11
Merge pull request #986 from jverzani/pull-request/aa9c8c9d

Tag SymPy v0.2.11
Tag SymPy v0.2.12
Merge pull request #987 from jverzani/pull-request/e62a235b

Tag SymPy v0.2.12
Tag TimeSeries v0.4.2