Replace Mono json serializer with modded MiniJson

MiniJson was modified to use ExpandoOjbect for objects and _root.Array
for arrays, rather than C# types.
Capabilities now return the correct preferred language for ios
VectorKeyEnumeratorClass now implements IDisposable
ArrayKeyEnumeratorClass now implements IDisposable
ShimEnumerator now implements IDisposable
ArrayEnumeratorClass now implements IDisposable
VectorEnumeratorClass now implements IDisposable
Mark interface regions in pscorlib/Dictionary.cs
Merge branch 'fix-warning-about-idisposable'

While inlining methods I noticed some classes did not implement the
IDisposable interface, even though they had a Dispose method. This fixes
the warning by implementing such interface.
Sprinkle the AggressiveInlining love in pscorlib/Vector.cs
Remove #ifdefs surrounding AggressiveInlining in pscorlib/Vector.cs
Add AggressiveInlining to small methods in pscorlib/Array.cs
Remove #ifdefs surrounding AggressiveInlining in pscorlib/Array.cs
Add AggressiveInlining to small methods in pscorlib/Dictionary.cs
Set Playscript projects to target .NET 4.5
Remove #ifdef surrounding AggressiveInlining in Dynamic.cs
Be less aggressive when using AggressiveInlining in Vector.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them.
Be less aggressive whe using AggressiveInlining in Array.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them. Note that there ars still a
few MoveNext and Current methods that have more than 4 statements but
still include the AggressiveInlining attribute. I left them because
they're likely to be called often.
Be less aggressive when using AggressiveIlining in Dictionary.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them. Some MoveNext and Current
methods still have the AggressiveInlining attribute as they are likely
to be called often.
Merge branch 'sprinkle-inline'