doc: Mention python dep in downloads page

Closes #3604
Merge branch 'v0.11.6-release'
Now working on 0.11.7
blog: v0.11.6
uv: Upgrade v0.10.14
2013.08.21, Version 0.10.17 (Stable)

* uv: Upgrade v0.10.14

* http_parser: Do not accept PUN/GEM methods as PUT/GET (Chris Dickinson)

* tls: fix assertion when ssl is destroyed at read (Fedor Indutny)

* stream: Throw on 'error' if listeners removed (isaacs)

* dgram: fix assertion on bad send() arguments (Ben Noordhuis)

* readline: pause stdin before turning off terminal raw mode (Daniel Chatfield)
vm, core, module: re-do vm to fix known issues

As documented in #3042 and in [1], the existing vm implementation has
many problems. All of these are solved by @brianmcd's [contextify][2]
package. This commit uses contextify as a conceptual base and its code
core to overhaul the vm module and fix its many edge cases and caveats.

Functionally, this fixes #3042. In particular:

- A context is now indistinguishable from the object it is based on
  (the "sandbox"). A context is simply a sandbox that has been marked
  by the vm module, via `vm.createContext`, with special internal
  information that allows scripts to be run inside of it.
- Consequently, items added to the context from anywhere are
  immediately visible to all code that can access that context, both
  inside and outside the virtual machine.

This commit also smooths over the API very slightly:

- Parameter defaults are now uniformly triggered via `undefined`, per
  ES6 semantics and previous discussion at [3].
- Several undocumented and problematic features have been removed, e.g.
  the conflation of `vm.Script` with `vm` itself, and the fact that
  `Script` instances also had all static `vm` methods. The API is now
  exactly as documented (although arguably the existence of the
  `vm.Script` export is not yet documented, just the `Script` class
  itself).

In terms of implementation, this replaces node_script.cc with
node_contextify.cc, which is derived originally from [4] (see [5]) but
has since undergone extensive modifications and iterations to expose
the most useful C++ API and use the coding conventions and utilities of
Node core.

The bindings exposed by `process.binding('contextify')`
(node_contextify.cc) replace those formerly exposed by
`process.binding('evals')` (node_script.cc). They are:

- ContextifyScript(code, [filename]), with methods:
  - runInThisContext()
  - runInContext(sandbox, [timeout])
- makeContext(sandbox)

From this, the vm.js file builds the entire documented vm module API.

node.js and module.js were modified to use this new native binding, or
the vm module itself where possible. This introduces an extra line or
two into the stack traces of module compilation (and thus into most
stack traces), explaining the changed tests.

The tests were also updated slightly, with all vm-related simple tests
consolidated as test/simple/test-vm-* (some of them were formerly
test/simple/test-script-*). At the same time they switched from
`common.debug` to `console.error` and were updated to use
`assert.throws` instead of rolling their own error-testing methods.

New tests were also added, of course, demonstrating the new
capabilities and fixes.

[1]: http://nodejs.org/docs/v0.10.16/api/vm.html#vm_caveats
[2]: https://github.com/brianmcd/contextify
[3]: https://github.com/joyent/node/issues/5323#issuecomment-20250726
[4]: https://github.com/kkoopa/contextify/blob/bf123f3ef960f0943d1e30bda02e3163a004e964/src/contextify.cc
[5]: https://gist.github.com/domenic/6068120
Merge branch 'v0.10.17-release' into v0.10
Now working on 0.10.18
blog: Post for v0.10.17
tools: script to report [un]stable build
tools: script release steps after jenkins build
vm: Put back display_errors flag

This is an important part of the repl use-case.

TODO: The arg parsing in vm.runIn*Context() is rather wonky.
It would be good to move more of that into the Script class,
and/or an options object.
buffer: adhere to INSPECT_MAX_BYTES
buffer: fix inspect throw if slice length too long

All the Buffer#{ascii,hex,etc.}Slice() methods are intentionally strict
to alert if a Buffer instance was attempting to be accessed out of
bounds. Buffer#toString() is the more user friendly way of accessing the
data, and will coerce values to their min/max on overflow.
util: pass opts to custom inspect functions

Objects with custom inpsect functions should get the options that were
passed to `util.inspect()`

fixes #5822
fixes #6098
buffer: fix regression in Buffer(buf) constructor

Commit 3a2f273b got the source and the target wrong when copying over
the data. Fix that and add a regression test.

Fixes #6111.
vm: remove unnecessary Persistent<FunctionTemplate>
vm: fix Persistent<Context> leak
uv: update to v0.10.15