Generics: C++ code generation.

Note that embedded schema structures in generated code are still incorrect.
Merge branch 'master' of github.com:kentonv/capnproto
Add Tim Popham's Javascript implementation to the list.
Fix everything that broke due to Jekyll moving from Maruku to Kramdown.
Generics: C++ code generation schema structure cross-linkage.
fix copy-paste bug in TestRpc_TailCall: add missing assertion
Merge pull request #130 from michaeledgar/nit

fix copy-paste bug in TestRpc_TailCall: add missing assertion
Generics: Methods with implicit type parameters.

See changes to test.capnp for example.

Currently only supported through generated code, not in the dynamic API. Not exactly sure how to expose this in the dynamic API...
Merge branch 'master' of github.com:kentonv/capnproto
Result -> Results
Merge pull request #131 from dwrensha/typo

Result -> Results
Adding new generic parameters over time is allowed; removing them is not.
Implement "lite mode", where reflection is disabled.

To use, pass --disable-reflection to the configure script.

This produces a smaller runtime library. However, using it for this purpose is not recommended. The main purpose of lite mode is to define a subset of Cap'n Proto which might plausibly compile under MSVC. MSVC still lacks full support for constexpr and expression SFINAE; luckily, most of our use of these things relates to reflection, and not all users need reflection.

Cap'n Proto lite mode inherits its name from Protocol Buffers' lite mode. However, there are some key differences:

- Protobuf generated code included global constructors related to registering descriptors and extensions. For many people, this was the main reason to use lite mode: to get rid of these global constructors and achieve faster startup times. Cap'n Proto, on the other hand, never had global constructors in the first place.

- Schemas are actually still available in lite mode, though only in their raw (Cap'n Proto structure) form. Only the schema API (which wraps the raw schemas in a more convenient interface) and reflection API (which offers a convenient way to use the schemas) are unavailable.

- Lite mode is enabled in an application by defining CAPNP_LITE rather than by specifying an annotation in the schema file. This better-reflects real-world usage patterns, where you typically want to enable lite mode application-wide anyway.

- We do not build the lite mode library by default. You must request it by passing --disable-reflection to the configure script. Before you can do that, you must have a prebuilt Cap'n Proto compiler binary available, since the compiler can't be built without reflection.

- Relatedly, the lite mode library is built with the same name as the full library. This library is not intended to be installed. If anything it should be statically linked. But, mostly the option only exists on non-MSVC platform to give us a way to test that we haven't broken lite mode.
Merge branch 'master' of github.com:kentonv/capnproto