Renames LexicalStructure to LexStructure

The old name was creating ambiguous error with global._
Merge pull request #133 from skyluc/issue/2.11.0-M3-compatibility

Renames LexicalStructure to LexStructure
Fixed typo in README
Unified handling of VM arguments and document's encoding

Commit SHA: 342e4bc8533495f1a1a7f8c5ee60925516a52558 allowed users to
pass specific VM arguments to the VM created to execute the worksheet.
However, that commit caused the worksheet file's encoding to be defaulted
to the system's encoding, if the "-Dfile.encoding" vm argument was not
explicitly provided by the user.

That's annoying, as the default encoding should just be the project's
encoding. And that's exactly the behavior implemented in this commit.

This commit also introduces a `VmArguments` class, which is a simple
container for manipulating VM arguments. For sure it could be much more
richer than it is now, but that is out of the scope of this commit.

Fix #138
Merge pull request #139 from dotta/issue/file-encoding-138

Unified handling of VM arguments and document's encoding
Scanner classes no longer need a `colorManager`

Updated codebase to comply with
scala-ide/scala-ide@SHA: 7d846dfdb40a0dd5c5f9ab6376931d1322ef0130
Merge pull request #142 from dotta/issue/scanner-classes-no-longer-use-colorManager

Scanner classes no longer need a `colorManager`
Bumped version to 0.2.1 for next development cycle
Merge pull request #143 from dotta/transient/bump-version-after-0.2.0-release

Transient/bump version after 0.2.0 release
Added keyboard shortcut to clear evaluation results

New eclipse Action added.

Keyboard shortcut Ctrl+Shift+C now clears evaluation results.

Fix #132.