Generate API docs from source code comments (#2491)

* Generate api docs from source code

* Add a bunch of doxygen comments

* more doxygen comments

* Add the in-progress api docs

* script to generate docs from travis

* Add doc generation to the travis job

* make travis_docs.sh commit the work it does

* make sure the docs script exits cleanly

1 files changed, 31 insertions, 0 deletions

diff --git a/docs/api_midi_device_setup_process.md b/docs/api_midi_device_setup_process.md
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+# group `midi_device_setup_process` {#group__midi__device__setup__process}
+
+These are method that you must use to initialize and run a device.
+
+## Summary
+
+ Members                        | Descriptions                                
+--------------------------------|---------------------------------------------
+`public void `[`midi_device_init`](#group__midi__device__setup__process_1gaf29deddc94ea98a59daa0bde1aefd9d9)`(`[`MidiDevice`](#struct__midi__device)` * device)`            | Initialize a device.
+`public void `[`midi_device_process`](#group__midi__device__setup__process_1gaa3d5993d0e998a1b59bbf5ab9c7b492b)`(`[`MidiDevice`](#struct__midi__device)` * device)`            | Process input data.
+
+## Members
+
+#### `public void `[`midi_device_init`](#group__midi__device__setup__process_1gaf29deddc94ea98a59daa0bde1aefd9d9)`(`[`MidiDevice`](#struct__midi__device)` * device)` {#group__midi__device__setup__process_1gaf29deddc94ea98a59daa0bde1aefd9d9}
+
+Initialize a device.
+
+You must call this before using the device in question.
+
+#### Parameters
+* `device` the device to initialize
+
+#### `public void `[`midi_device_process`](#group__midi__device__setup__process_1gaa3d5993d0e998a1b59bbf5ab9c7b492b)`(`[`MidiDevice`](#struct__midi__device)` * device)` {#group__midi__device__setup__process_1gaa3d5993d0e998a1b59bbf5ab9c7b492b}
+
+Process input data.
+
+This method drives the input processing, you must call this method frequently if you expect to have your input callbacks called.
+
+#### Parameters
+* `device` the device to process
+