Added integral_sequence implementation.

Added integral sequence implmentation because the gcc 4.8.1 does
not provided C++14 standard one.
Added placeholder traits and placeholder poistions.

Added is_placeholder (that default to standard one) and placeholder_positions
tratis, with default implementation for single argument placeholder.

Added _all and _from<N> placeholder objects and specialized the
new is_placeholder traits to use with them. The _from<N> should
be changed to variable template if compiler will support that.
Now using directive is used.
Implementation of bind function.

Added implementation of bind function. Implementation does not
support:
  - bind operator() vith cv
  - subbinds
  - bind<R> syntax