Fixed several issues with the build.jl script and add `Pkg.build("Pla…

…yground")` to .travis.yml.

* Fix doesn't support the '_' environment variable used to get the julia path so we
  resort to calling which julia if '_' isn't set.
* Logging.jl currently has an [issue](kmsquire/Logging.jl#28) where
  it will segfault writing to an invalid TTY occasionally (mostly due to a precompiled reference to STDOUT).

.travis.yml

@@ -11,7 +11,7 @@ notifications:
   email: false
 script:
   - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
-  - julia --depwarn=no -e 'Pkg.init(); Pkg.clone(pwd()); Pkg.clone("https://github.com/invenia/Mocking.jl"); Pkg.test("Playground";  coverage=true)'
+  - julia --depwarn=no -e 'Pkg.init(); Pkg.clone(pwd()); Pkg.build("Playground"); Pkg.clone("https://github.com/invenia/Mocking.jl"); Pkg.test("Playground";  coverage=true)'
 after_success:
   - julia -e 'cd(Pkg.dir("Playground")); Pkg.add("Coverage"); using Coverage; Codecov.submit(process_folder())'
   - julia -e 'cd(Pkg.dir("Playground")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder())'

deps/build.jl

@@ -1,10 +1,18 @@
 using Logging
 
-Logging.configure(level=Logging.INFO)
+Logging.configure(output=STDOUT, level=Logging.INFO)
 
 BUILDFILE_PATH = @__FILE__
 DEPS_PATH = dirname(BUILDFILE_PATH)
-JULIA_PATH = ENV["_"]
+JULIA_PATH = "#!/usr/bin/env julia"
+
+if haskey(ENV, "_")
+    JULIA_PATH = ENV["_"]
+else
+    try
+        JULIA_PATH = strip(readall(`which julia`))
+    end
+end
 
 include(joinpath(DEPS_PATH, "../src/Playground.jl"))
 
@@ -38,7 +46,7 @@ end
 #=
 Dynamically set the shebang in the playground script.
 This is necessary for several reasons:
-    1. /usr/bin/env will stall if we want to include the `--depwarn=noe`
+    1. /usr/bin/env will stall if we want to include the `--depwarn=no`
     2. people may have their default julia version installed in weird locations
     3. chances are that people will want playground to use the same julia environment that they installed it from.
 =#