Modified FSharpMemberFunctionOrValue to include an Overloads property.

This property returns all the overloads of the current MethodInfos
defined apart from the defining MethodInfo from
FSharpMemberFunctionOrValue.

e.g for DateTime.Now.ToString() would have a symbol of
FSharpMemberFunctionOrValue with an initial signature defined of:
 unit -> string

with Overloads of
IFormatProvider -> string
string -> string
string * IFormatProvider -> string
Add method GetDeclarationSymbols to CheckFileResults/TypeCheckInfo

This allows FSharpSymbols to be returned from the current location
rather than a textual DeclarationSet.  This means that each symbol can
be queried and interpreted by the editor as it sees fit.
Change links to use https.
Add IsOptionalArg and related properties to FSharpParameter

Close #203.
Add IsLiteral/LiteralValue to FSharpField

Also updated corresponding tests
Fixes #197
Use named arguments for primitive types
Merge pull request #198 from kurtschelfthout/patch-1

Change links to use https.
Merge pull request #205 from dungpa/optional-arg

Add IsOptionalArg and related properties to FSharpParameter
Merge pull request #207 from 7sharp9/197

Add IsLiteral/LiteralValue to FSharpField
Added xmldoc summary
Apply the same filtering as used by GetDeclarationSymbols

We might want to change this in the future to allow retrieval of only
certain symbol types at a declaration point, so Ive chased not to
refactor the common filtering in ServiceDeclarations.  We want to
provide an option to show operators for instance etc.
Added tests for GetDeclarationSymbols

These tests are the symbol version of the GetDeclarations tests.
Add TryFullName to FSharpEntity
Check default/override members via 'IsOverrideOrExplicitMember'

Close #208.
Merge pull request #210 from dungpa/override-member

Check default/override members via 'IsOverrideOrExplicitMember'
Merge pull request #209 from dungpa/try-fullname

Add TryFullName to FSharpEntity
Merge pull request #182 from 7sharp9/getDeclSymbols

Add method GetDeclarationSymbols method to CheckFileResults/TypeCheckInfo