Specify runtime parameters in TOML format config file

In addition to specifying parameters in the command line and environment variables, you can now omit all parameters and provide a config file.

Example:

./documize myconfig.conf

Note: there is no switch setting, just provide the filename as an argument.

Fixes #243

vendor/github.com/BurntSushi/toml/.travis.yml

@@ -0,0 +1,15 @@
+language: go
+go:
+  - 1.1
+  - 1.2
+  - 1.3
+  - 1.4
+  - 1.5
+  - 1.6
+  - tip
+install:
+  - go install ./...
+  - go get github.com/BurntSushi/toml-test
+script:
+  - export PATH="$PATH:$HOME/gopath/bin"
+  - make test