some minor fixes

GenericDocument::ParseStream: make SourceEncoding optional

GenericDocument: forward allocator to GenericReader

GenericValue: explicit constructors

GenericValue: fixup construction from NumberType

drop trailing commas in enums

FileStream::current_ is now explicitly initialized in the constructor.
Avoids reading the garbage value in case of an empty file.

The MemoryPoolAllocator implementation cannot and should not be
copied (Rule of Three).  Declare copy constructor and copy-assignment
operator as private.

This patch fixes some misspellings of "allocator" in document.h.
Fixes the Doxygen documentation of GenericDocument as well.

The ParseStream() function current requires explicitly passing
the SourceEncoding parameter as explicit template argument
while the other Parse*() functions provide overloads to omit
this parameter and use the document's own encoding by default.

This patch adds the corresponding overload for ParseStream(),
enabling the simple usage again:

  rapidjson::FileStream is(fp);
  rapidjson::Document   d;
  d.ParseStream<0>(is);

Fixes http://code.google.com/p/rapidjson/issues/detail?id=72.

In case of overloaded functions taking either a GenericValue or another
class that can also be constructed from the same primitive types
(e.g. std::string, which can be constructed from const char*), the
overloading becomes ambiguous:

  void foo( const std::string& );
  void foo( const rapidjson::Value & );

Declaring the GenericValue constructors taking primitive types as
'explicit' avoids this problem.  This should not have any negative
side-effects, since a GenericValue can't be copied or implicitly
converted to other types.

Fixes http://code.google.com/p/rapidjson/issues/detail?id=70.

Constructing an empty GenericValue with a specific Type has failed
for any kNumberType (Int, Int64, Double...) due to incomplete definition
of the corresponding default flag value.

This patch adds a new constant kNumberAnyFlag to the flags enumeration
in GenericValue to cover this case.

This fixes http://code.google.com/p/rapidjson/issues/detail?id=57

In C++'98/03, trailing commas in enumerations are not allowed, but have
been introduced in C++11.  This patch drops the trailing commas in order
to avoid compiler warnings (e.g. GCC with -pedantic).

Fixes http://code.google.com/p/rapidjson/issues/detail?id=49.

This reverts commit e4ffa48a.

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Makes GenericValue::FindMember() public.
Added array element and object member iteration APIs in examples.

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Fixed a bug for using Reader with AutoUTFInputStream 

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