Update Microsoft restriction and limitations (#725)

* Update Microsoft restriction and limitations about windows naming files to include '~' for folder names

src/onedrive.d

@@ -868,7 +868,8 @@ final class OneDriveApi
 			case 400:
 				// Bad Request .. how should we act?
 				log.vlog("OneDrive returned a 'HTTP 400 - Bad Request' - gracefully handling error");
-				break;
+				// make sure this is thrown so that it is caught
+				throw new OneDriveException(http.statusLine.code, http.statusLine.reason, response);
 			
 			// 403 - Forbidden
 			case 403:

src/sync.d

@@ -2419,6 +2419,11 @@ final class SyncEngine
 								// but when we attempted to create it, OneDrive responded that it now already exists
 								log.vlog("OneDrive reported that ", path, " already exists .. OneDrive API race condition");
 								return;
+							} else {
+								// some other error from OneDrive was returned - display what it is
+								log.error("OneDrive generated an error when creating this path: ", path);
+								displayOneDriveErrorMessage(e.msg);
+								return;
 							}
 						}
 						// Is the response a valid JSON object - validation checking done in saveItem

src/util.d

@@ -190,6 +190,8 @@ bool isValidName(string path)
 	if (itemName == "desktop.ini") {matched = false;}
 	// _vti_ cannot appear anywhere in a file or folder name
 	if(canFind(itemName, "_vti_")){matched = false;}
+	// Item name cannot equal '~'
+	if (itemName == "~") {matched = false;}
 	
 	// return response
 	return matched;