Added Russian translation
Added Greek translation
Added Vietnamese translation
Add JsonValue

Given its ECMAScript inheritance, JSON allows only four types of values:

  - integer numbers
  - floating point numbers
  - booleans
  - strings

We can efficiently represent a JSON value using a simple, reference
counted structure, that behaves similarly to GValue but without the
baggage of the whole type system.

For the time being, we should keep the whole JsonValue internal: we
already specify typed public accessors, so there's no need to complicate
the API any further.
node: Replace GValue with JsonValue

Given our needs, GValue is terribly overengineered. We do not need
transformability, and we only have four types of data which won't be
extended. At the same time, GValue is lacking: it can only be copied
around, whereas everything else inside a JsonNode is reference counted.

We can now use the newly introduced JsonValue to replace our usage of
GValue to store values inside a JsonNode, giving us a simpler, reference
counted storage type.
tests: Add more coverage to JsonNode
Use lcov instead of gcov for test coverage reports

With lcov we get nicer reporting tools, with HTML output.
Improve test coverage
scanner: Mark all symbols as internal

The JsonScanner API is purely internal; the symbols it exposes should
not end up in the shared library ABI.
build: Add abicheck.sh

The abicheck.sh script is used to check that the actural ABI we expose
in our shared library is the same as the expected one we encode inside
the json-glib.symbols file.

Using abicheck.sh at check time, we can verify that: a) the symbols file
is up to date and b) we're not unintentionally leaking private symbols
to the outside world.
symbols: Add missing functions
build: Drop dependency on gnome-autogen.sh

Use autoreconf instead.
NEWS: Update
docs: Add missing symbols

The deprecation macros should be in the private section.
Release JSON-GLib 0.15.2 (snapshot)
Post-release version bump to 0.15.3
doap: Change my email address to @gnome.org
Updated Norwegian bokmål translation
Assamese translation completed
Updated Traditional Chinese translation(Hong Kong and Taiwan)