Further fixes for Evernote#104, Evernote#105, #109, and #117

Added the "SendToEvernoteActivity" directory to the header search
paths. Including it with the directory worked for CocoaPods with
Objective-C, but not for Swift.

This may cause an error for those including it via a framework, but
since CocoaPods can't deal with this consistently, flattening the
heirarchy will be a better long term fix

Also, bumped to 2.0.6

evernote-cloud-sdk-ios.podspec

@@ -1,13 +1,13 @@
 Pod::Spec.new do |spec|
   spec.name = "evernote-cloud-sdk-ios"
-  spec.version = "2.0.5"
+  spec.version = "2.0.6"
   spec.summary = "Evernote Cloud SDK for iOS."
   spec.homepage = "https://github.com/evernote/evernote-cloud-sdk-ios"
   spec.license = '  https://github.com/evernote/evernote-cloud-sdk-ios/blob/master/LICENSE'
   spec.authors = { 'Evernote' => '[email protected]' }
-  spec.source = { :git => "https://github.com/evernote/evernote-cloud-sdk-ios.git", :tag => "2.0.5"}
+  spec.source = { :git => "https://github.com/evernote/evernote-cloud-sdk-ios.git", :tag => "2.0.6"}
   spec.ios.deployment_target = "8.0"
-  spec.xcconfig = {'HEADER_SEARCH_PATHS' => '$(SDKROOT)/usr/include/libxml2'}
+  spec.xcconfig = {'HEADER_SEARCH_PATHS' => '$(SDKROOT)/usr/include/libxml2 ${PODS_ROOT}/Headers/Public/evernote-cloud-sdk-ios/SendToEvernoteActivity'}
 
   spec.header_mappings_dir = "evernote-sdk-ios/"
   spec.source_files = "evernote-sdk-ios/**/*.{h,m}",

evernote-sdk-ios/ENSDK/ENSDK.h

@@ -36,5 +36,5 @@
 #import "ENSession.h"
 #import "ENCommonUtils.h"
 
-#import "SendToEvernoteActivity/ENSaveToEvernoteActivity.h"
+#import "ENSaveToEvernoteActivity.h"
 

evernote-sdk-ios/ENSDK/SendToEvernoteActivity/ENSaveToEvernoteViewController.m

@@ -34,6 +34,7 @@
 #import "RMSTokenView.h"
 #import "ENNotebookPickerView.h"
 #import "ENSDKPrivate.h"
+#import "ENSaveToEvernoteActivity.h"
 
 #define kTitleViewHeight        50.0
 #define kTagsViewHeight         44.0